Deep-Dive Analysis
Landmark Cases
The most important and frequently tested cases in American law, analyzed in depth. Each page goes beyond a standard case brief to cover reasoning, dissents, key quotes, legacy, exam relevance, and study tips — everything you need to master the cases that shape every law school course.
Constitutional Law
Marbury v. Madison
Marbury v. Madison is the foundational case establishing the power of judicial review, enabling federal courts to declare acts of Congress unconstitutional. It transformed the judiciary from the weakest branch into a co-equal partner in governance. The decision remains the single most important case in American constitutional law.
McCulloch v. Maryland
McCulloch v. Maryland established two foundational principles of constitutional law: that Congress possesses implied powers beyond those explicitly enumerated in the Constitution, and that federal law is supreme over state law under the Supremacy Clause. The case broadly construed congressional power and remains the leading authority on the Necessary and Proper Clause.
Gibbons v. Ogden
Gibbons v. Ogden was the first major Commerce Clause case and established that the federal commerce power extends to all commercial intercourse among the states, including navigation. The decision broadly defined commerce and set the stage for expansive federal regulatory authority. It also established that federal law preempts conflicting state regulation of interstate commerce.
Wickard v. Filburn
Wickard v. Filburn represents the high-water mark of Commerce Clause power, holding that Congress can regulate purely local activity if, when aggregated across all similarly situated actors, it substantially affects interstate commerce. The aggregation principle dramatically expanded federal regulatory reach and remained the dominant framework for over fifty years.
Heart of Atlanta Motel, Inc. v. United States
Heart of Atlanta Motel upheld the constitutionality of Title II of the Civil Rights Act of 1964 under the Commerce Clause, establishing that Congress could prohibit racial discrimination by private businesses that serve interstate travelers. The case demonstrated the Commerce Clause's power as a tool for civil rights enforcement and confirmed that Congress could regulate moral wrongs through its commerce power.
United States v. Lopez
United States v. Lopez was the first case in nearly sixty years in which the Supreme Court struck down a federal statute as exceeding Congress's Commerce Clause power. The decision reestablished that the Commerce Clause has judicially enforceable limits and articulated a three-category framework for analyzing commerce power that remains the governing test today.
United States v. Morrison
Morrison extended Lopez by striking down the civil remedy provision of the Violence Against Women Act, holding that gender-motivated violence is not economic activity subject to Commerce Clause regulation despite extensive congressional findings of its economic impact. The case also held that Congress cannot use Section 5 of the Fourteenth Amendment to regulate purely private conduct.
Gonzales v. Raich
Gonzales v. Raich reaffirmed the broad reach of the Commerce Clause by holding that Congress can regulate the local cultivation and use of marijuana even where state law permits it, because marijuana is a fungible commodity traded in interstate markets. The case reconciled the expansive Wickard precedent with the limiting principles of Lopez and Morrison.
National Federation of Independent Business v. Sebelius
NFIB v. Sebelius upheld the Affordable Care Act's individual mandate as a valid exercise of the taxing power while holding it exceeded the Commerce Clause because Congress cannot compel individuals to engage in commerce. The case also established that Congress cannot use the spending power to coerce states by threatening to withdraw all existing Medicaid funding.
Lochner v. New York
Lochner v. New York is one of the most criticized cases in Supreme Court history, striking down a maximum working hours law for bakers as violating a substantive due process right to freedom of contract. The case gave its name to the 'Lochner era,' during which the Court aggressively struck down economic regulations, and it remains a cautionary example of judicial overreach in constitutional law courses.
West Coast Hotel Co. v. Parrish
West Coast Hotel v. Parrish effectively ended the Lochner era by upholding a state minimum wage law for women and overruling Adkins v. Children's Hospital. The decision marked the beginning of the Court's modern deference to economic regulation and is often called 'the switch in time that saved nine,' as it came during President Roosevelt's court-packing controversy.
Griswold v. Connecticut
Griswold v. Connecticut established a constitutional right to privacy, holding that the Bill of Rights creates zones of privacy through its penumbras and emanations. The case struck down a state law prohibiting the use of contraceptives by married couples and laid the doctrinal foundation for later reproductive rights and personal autonomy decisions.
Roe v. Wade
Roe v. Wade held that the constitutional right to privacy encompasses a woman's decision to have an abortion, establishing a trimester framework for balancing that right against the state's interests in maternal health and potential life. The case was one of the most controversial and consequential decisions in Supreme Court history, shaping American politics for nearly fifty years until it was overruled by Dobbs v. Jackson Women's Health Organization in 2022.
Planned Parenthood of Southeastern Pennsylvania v. Casey
Casey reaffirmed the essential holding of Roe v. Wade -- that women have a constitutional right to obtain an abortion before viability -- but replaced the trimester framework with the undue burden standard. The joint opinion's extensive discussion of stare decisis became one of the most important treatments of that doctrine in constitutional law. The case governed abortion jurisprudence for thirty years until Dobbs.
Dobbs v. Jackson Women's Health Organization
Dobbs overruled Roe v. Wade and Planned Parenthood v. Casey, holding that the Constitution does not confer a right to abortion. The decision returned the authority to regulate abortion to the states and the people, fundamentally reshaping reproductive rights in America. It is one of the most consequential overrulings in Supreme Court history.
Obergefell v. Hodges
Obergefell v. Hodges established that same-sex couples have a fundamental right to marry under both the Due Process Clause and the Equal Protection Clause of the Fourteenth Amendment. The decision required all states to license and recognize same-sex marriages, making marriage equality the law of the land.
Lawrence v. Texas
Lawrence v. Texas struck down state sodomy laws as violating the liberty protected by the Due Process Clause, overruling Bowers v. Hardwick. The decision established that intimate consensual sexual conduct between adults is protected by the Constitution and marked a major advance in LGBTQ rights and personal autonomy doctrine.
Brown v. Board of Education of Topeka
Brown v. Board of Education is among the most important decisions in American constitutional history, holding that racial segregation in public schools violates the Equal Protection Clause. The decision overruled Plessy v. Ferguson's separate but equal doctrine in the context of public education and catalyzed the modern civil rights movement.
Plessy v. Ferguson
Plessy v. Ferguson established the separate but equal doctrine, holding that racial segregation in public facilities did not violate the Fourteenth Amendment as long as the separate facilities were equal. The decision provided the constitutional framework for Jim Crow laws that persisted for nearly sixty years until Brown v. Board of Education overruled it in the context of public education.
Loving v. Virginia
Loving v. Virginia struck down state laws prohibiting interracial marriage, holding that such laws violate both the Equal Protection Clause and the Due Process Clause of the Fourteenth Amendment. The case established that marriage is a fundamental right and that racial classifications are subject to strict scrutiny, and it became a critical precedent for later cases on marriage equality.
Korematsu v. United States
Korematsu upheld the internment of Japanese Americans during World War II, applying strict scrutiny to a racial classification for the first time but finding the classification justified by military necessity. The case is widely regarded as one of the Supreme Court's worst decisions and was formally repudiated by the Court in Trump v. Hawaii (2018), though it was never technically overruled.
Regents of the University of California v. Bakke
Bakke produced a fractured set of opinions that collectively held that racial quotas in university admissions are unconstitutional but that race may be considered as one factor among many in a holistic admissions process. Justice Powell's influential opinion identified diversity as a compelling interest in higher education, an approach later adopted by a majority in Grutter v. Bollinger.
Grutter v. Bollinger
Grutter v. Bollinger adopted Justice Powell's diversity rationale from Bakke as the holding of a majority of the Court, upholding race-conscious admissions at the University of Michigan Law School. The decision confirmed that student body diversity is a compelling interest and that narrowly tailored, holistic consideration of race in admissions is constitutionally permissible. The case governed affirmative action in higher education for twenty years until Students for Fair Admissions.
Students for Fair Admissions, Inc. v. President and Fellows of Harvard College
Students for Fair Admissions effectively ended race-conscious admissions in American higher education, holding that the admissions programs at Harvard and the University of North Carolina violated the Equal Protection Clause. The decision overruled the framework established in Grutter v. Bollinger and rejected the use of race as a factor in college admissions, fundamentally reshaping affirmative action law.
New York Times Co. v. Sullivan
New York Times v. Sullivan revolutionized First Amendment law by constitutionalizing the law of defamation and establishing the actual malice standard for public officials. The decision held that the First Amendment requires public officials to prove that a defamatory statement was made with knowledge of its falsity or reckless disregard for the truth, creating essential breathing space for robust public debate.
Brandenburg v. Ohio
Brandenburg v. Ohio established the modern test for when the government may punish speech advocating illegal action, holding that the First Amendment protects such speech unless it is directed to inciting imminent lawless action and is likely to produce such action. The case overruled Whitney v. California and replaced the clear and present danger test with a more speech-protective standard.
Tinker v. Des Moines Independent Community School District
Tinker established that students do not shed their constitutional rights to freedom of expression at the schoolhouse gate. The decision held that student speech in public schools is protected by the First Amendment unless it materially and substantially disrupts the work and discipline of the school. The case remains the foundational precedent for student free speech rights.
Texas v. Johnson
Texas v. Johnson held that flag burning is constitutionally protected symbolic speech under the First Amendment. The decision established that the government cannot prohibit the expression of an idea simply because society finds it disagreeable or offensive, and it remains the leading case on the protection of symbolic political protest.
Citizens United v. Federal Election Commission
Citizens United held that the First Amendment prohibits the government from restricting independent political expenditures by corporations, associations, and labor unions. The decision struck down key provisions of the Bipartisan Campaign Reform Act and overruled Austin v. Michigan Chamber of Commerce, transforming campaign finance law and enabling unlimited corporate spending in elections.
District of Columbia v. Heller
Heller established for the first time that the Second Amendment protects an individual right to possess firearms for traditionally lawful purposes, such as self-defense within the home, independent of service in a militia. The decision struck down the District of Columbia's handgun ban and trigger lock requirement, fundamentally reshaping Second Amendment jurisprudence.
Civil Procedure
Pennoyer v. Neff
Pennoyer established the foundational framework for personal jurisdiction under the Due Process Clause of the Fourteenth Amendment. It held that a state court's jurisdiction over persons and property is limited by the territorial boundaries of the state. This case dominated personal jurisdiction analysis for nearly 70 years until International Shoe modernized the doctrine.
International Shoe Co. v. Washington
International Shoe revolutionized personal jurisdiction by replacing the rigid territorial framework of Pennoyer with the flexible 'minimum contacts' test. The case held that due process requires only that a defendant have sufficient minimum contacts with the forum state such that the exercise of jurisdiction does not offend traditional notions of fair play and substantial justice. This remains the governing standard for personal jurisdiction in American courts.
World-Wide Volkswagen Corp. v. Woodson
World-Wide Volkswagen refined the minimum contacts test by holding that the unilateral activity of a consumer bringing a product into a forum state cannot create jurisdiction over the seller or distributor. The case established that foreseeability relevant to jurisdiction is not whether the product might end up in the forum, but whether the defendant's conduct and connection with the forum state are such that it should reasonably anticipate being haled into court there.
Asahi Metal Industry Co. v. Superior Court of California
Asahi produced a fractured Court on the stream of commerce theory of personal jurisdiction but established that the exercise of jurisdiction must satisfy a reasonableness analysis even if minimum contacts exist. The case created a lasting split between Justice O'Connor's 'stream of commerce plus' test (requiring additional conduct directed at the forum) and Justice Brennan's pure stream of commerce test (placement into the stream is sufficient).
Burnham v. Superior Court of California
Burnham unanimously upheld the validity of transient jurisdiction (tag jurisdiction), holding that personal service on a defendant physically present in the forum state is sufficient to establish personal jurisdiction, regardless of the minimum contacts analysis. The case confirmed that the traditional basis for jurisdiction recognized in Pennoyer survived International Shoe.
Daimler AG v. Bauman
Daimler dramatically narrowed general jurisdiction over corporations by holding that a corporation is subject to general jurisdiction only where it is 'at home,' which is typically limited to its state of incorporation and its principal place of business. The decision rejected the notion that systematic and continuous contacts alone are sufficient for general jurisdiction.
Bristol-Myers Squibb Co. v. Superior Court of California
Bristol-Myers Squibb tightened the requirements for specific jurisdiction by holding that there must be an affiliation between the forum and the specific claims at issue. The case held that nonresident plaintiffs could not join their claims with resident plaintiffs' claims in a state court that lacked an adequate connection between the forum and the nonresidents' specific claims.
Ford Motor Co. v. Montana Eighth Judicial District Court
Ford Motor Co. clarified the 'arise out of or relate to' requirement for specific jurisdiction, holding that a strict causal connection between the defendant's forum contacts and the plaintiff's claims is not required. Instead, specific jurisdiction exists when the defendant's contacts with the forum 'relate to' the plaintiff's claims, even without but-for causation. The case adopted a broader understanding of the nexus requirement for specific jurisdiction.
Erie Railroad Co. v. Tompkins
Erie overruled Swift v. Tyson and held that there is no federal general common law; federal courts sitting in diversity must apply the substantive law of the state in which they sit. The decision transformed the relationship between federal and state courts and remains one of the most important federalism decisions in American law.
Hanna v. Plumer
Hanna established the framework for resolving conflicts between the Federal Rules of Civil Procedure and state law in diversity cases. It held that a valid Federal Rule, promulgated under the Rules Enabling Act, governs even if it differs from state law, as long as the Rule is within Congress's constitutional authority and does not abridge, enlarge, or modify substantive rights. The case clarified and refined the Erie doctrine.
Shady Grove Orthopedic Associates, P.A. v. Allstate Insurance Co.
Shady Grove addressed whether Federal Rule 23 governing class actions controls over a state law prohibiting class actions for certain claims in federal diversity actions. The plurality held that when a Federal Rule answers the question in dispute, the Federal Rule governs if it is valid under the Rules Enabling Act. The case further refined the Erie/Hanna framework and produced an important split on how to interpret the scope of Federal Rules.
Conley v. Gibson
Conley v. Gibson established the liberal 'no set of facts' standard for evaluating motions to dismiss under Federal Rule 12(b)(6). For fifty years, it stood for the proposition that a complaint should not be dismissed unless it appears beyond doubt that the plaintiff can prove no set of facts in support of the claim that would entitle relief. This standard was later abrogated by Twombly and Iqbal.
Bell Atlantic Corp. v. Twombly
Twombly replaced the longstanding Conley v. Gibson 'no set of facts' standard with the 'plausibility' standard for motions to dismiss under Rule 12(b)(6). The decision held that a complaint must contain enough factual matter, accepted as true, to state a claim to relief that is plausible on its face. This represented a significant tightening of federal pleading requirements.
Ashcroft v. Iqbal
Iqbal confirmed that the Twombly plausibility standard applies to all federal civil actions, not just antitrust cases, and articulated a clear two-step methodology for evaluating motions to dismiss. The case also addressed the scope of qualified immunity for high-ranking government officials and significantly tightened pleading requirements across all areas of federal litigation.
Celotex Corp. v. Catrett
Celotex clarified the burden on a moving party seeking summary judgment under Federal Rule 56. It held that the moving party does not bear the initial burden of producing evidence negating the nonmovant's claim; rather, it need only point out the absence of a genuine issue of material fact. This decision, part of the 'summary judgment trilogy,' made summary judgment significantly easier to obtain.
Anderson v. Liberty Lobby, Inc.
Anderson v. Liberty Lobby, part of the summary judgment trilogy, established that the substantive evidentiary standard of proof applicable to the claim (such as clear and convincing evidence) applies at the summary judgment stage. It clarified that a dispute about a material fact is 'genuine' only if the evidence is such that a reasonable jury could return a verdict for the nonmoving party.
Matsushita Electric Industrial Co. v. Zenith Radio Corp.
Matsushita, the third case in the summary judgment trilogy, held that when the nonmovant's theory of the case is economically implausible, the nonmovant must present more persuasive evidence to survive summary judgment. The decision established that courts should consider the plausibility of the nonmovant's theory when evaluating whether a genuine dispute of material fact exists.
Hansberry v. Lee
Hansberry established the constitutional due process requirement for class action representation: absent class members are bound by a class judgment only if their interests were adequately represented in the prior action. The case set the foundational due process limits on class action preclusion that later informed Rule 23.
Phillips Petroleum Co. v. Shutts
Phillips Petroleum v. Shutts established the due process requirements for binding absent class members in a class action and addressed the personal jurisdiction implications of nationwide class actions. The case held that a state may exercise jurisdiction over absent class members without minimum contacts, provided certain procedural protections are afforded. It also held that a state may not apply its own substantive law to claims with no connection to the forum.
Wal-Mart Stores, Inc. v. Dukes
Wal-Mart v. Dukes tightened the requirements for class certification under Rule 23, particularly the commonality requirement of Rule 23(a)(2). The Court held that commonality requires not just common questions but common answers — that the class claims must depend upon a common contention capable of classwide resolution. The decision significantly raised the bar for employment discrimination class actions and large-scale class litigation.
Louisville & Nashville Railroad Co. v. Mottley
Mottley established the well-pleaded complaint rule for federal question jurisdiction under 28 U.S.C. Section 1331. The case held that federal question jurisdiction exists only when the federal issue appears on the face of the plaintiff's well-pleaded complaint, not when federal issues arise merely as anticipated defenses. This remains the fundamental test for determining federal question jurisdiction.
Strawbridge v. Curtiss
Strawbridge established the rule of complete diversity for diversity jurisdiction under Article III and 28 U.S.C. Section 1332. The case held that diversity jurisdiction requires that no plaintiff be a citizen of the same state as any defendant, a stricter requirement than minimal diversity. This interpretation has governed diversity jurisdiction for over two centuries.
Mas v. Perry
Mas v. Perry is the leading case on determining domicile for diversity jurisdiction purposes. It established key principles for determining a person's state citizenship, including that a married woman's domicile is not automatically that of her husband, that students do not necessarily acquire domicile in the state where they attend school, and that domicile requires both physical presence and intent to remain.
Parklane Hosiery Co. v. Shore
Parklane Hosiery approved the use of offensive nonmutual collateral estoppel in federal courts, allowing a plaintiff who was not a party to a prior action to use a prior judgment against a defendant who was a party to the earlier suit. The decision expanded the doctrine of issue preclusion while establishing important safeguards against its unfair application.
Markman v. Westview Instruments, Inc.
Markman held that the construction of patent claims is a matter of law for the judge, not a question of fact for the jury, even though the Seventh Amendment preserves the right to a jury trial in patent infringement cases. The decision clarified the allocation of responsibilities between judge and jury and established the 'Markman hearing' as a standard feature of patent litigation.
Contracts
Hadley v. Baxendale
Hadley v. Baxendale established the foundational rule for consequential damages in contract law, limiting recovery to losses that were reasonably foreseeable at the time of contracting. The case created a two-part test that distinguishes between general damages arising naturally from the breach and special damages arising from circumstances communicated to the breaching party. This rule remains the cornerstone of contract damages analysis in both English and American law.
Lucy v. Zehmer
Lucy v. Zehmer established the objective theory of contracts as the controlling standard for determining whether a valid contract exists, holding that a party's outward manifestations of intent govern rather than their subjective, undisclosed mental state. The case demonstrates that even a contract written on a bar napkin while drinking can be enforceable if a reasonable person would believe the offer was serious. It remains one of the most widely taught cases on mutual assent and contract formation.
Hamer v. Sidway
Hamer v. Sidway established that forbearance from a legal right constitutes valid consideration for a contract, even if the forbearance benefits the promisor or the promisee is not actually harmed by the restraint. The case broadened the understanding of consideration by moving away from the requirement that consideration must involve a detriment in the common sense of harm or loss. It remains a foundational case on the doctrine of consideration in American contract law.
Carlill v. Carbolic Smoke Ball Co.
Carlill v. Carbolic Smoke Ball Co. is a landmark case on unilateral contracts, establishing that an advertisement can constitute a binding offer to the world at large when its terms are sufficiently definite and the offeror manifests a clear intent to be bound. The case also clarified that performance of the requested act constitutes both acceptance and consideration in a unilateral contract, and that communication of acceptance is not required. It remains one of the most celebrated cases in the common law of contracts.
Hawkins v. McGee
Known as the 'Hairy Hand Case,' Hawkins v. McGee is the foundational case on expectation damages in contract law, establishing that the proper measure of contract damages is the difference between the value of what was promised and the value of what was actually delivered. The case drew a clear distinction between contract damages (putting the plaintiff in the position performance would have achieved) and tort damages (restoring the plaintiff to their pre-injury position). It is one of the most iconic first-year Contracts cases.
Sullivan v. O'Connor
Sullivan v. O'Connor is a leading case on the availability of reliance damages as an alternative to expectation damages in breach of contract actions, particularly in the context of physician-patient contracts. The court held that reliance damages may be the more appropriate measure where expectation damages are too speculative or difficult to calculate. The case is frequently paired with Hawkins v. McGee to illustrate the different measures of contract damages.
Jacob & Youngs, Inc. v. Kent
Jacob & Youngs v. Kent is the seminal case on the doctrine of substantial performance, holding that a party who has substantially performed a contract in good faith is entitled to recover on the contract despite minor, unintentional deviations from its terms. The case also established that the proper measure of damages for a non-material breach is the diminution in value, not the cost of replacement, when the cost of correction would involve economic waste. Justice Cardozo's opinion is one of the most celebrated in American contract law.
Peevyhouse v. Garland Coal & Mining Co.
Peevyhouse v. Garland Coal is a controversial and widely debated case on the measure of contract damages, holding that diminution in value rather than cost of performance is the proper measure when the cost of remedying the defect is grossly disproportionate to the resulting increase in property value. The case raises fundamental questions about whether contract law should protect the promisee's subjective expectations or limit recovery to objective economic loss. It is frequently paired with Jacob & Youngs v. Kent in casebook discussions of damages.
Williams v. Walker-Thomas Furniture Co.
Williams v. Walker-Thomas Furniture is the leading case on unconscionability in contract law, establishing a two-part test distinguishing between procedural unconscionability (unfairness in the bargaining process) and substantive unconscionability (unfairness in the contract terms). The case brought the unconscionability doctrine from UCC Section 2-302 into prominence and applied it to protect consumers from oppressive contract terms. It is one of the most important cases on the limits of freedom of contract.
Wood v. Lucy, Lady Duff-Gordon
Wood v. Lucy, Lady Duff-Gordon is a landmark case on implied obligations and the duty of good faith in contract law. Justice Cardozo's opinion held that an exclusive dealing agreement imposes an implied obligation of reasonable efforts on the party granted exclusive rights, saving the contract from being struck down as illusory. The case established the foundation for the implied duty of best efforts or reasonable efforts that was later codified in the Uniform Commercial Code.
Lefkowitz v. Great Minneapolis Surplus Store
Lefkowitz v. Great Minneapolis Surplus Store is the leading American case establishing that an advertisement can constitute a binding offer, rather than a mere invitation to negotiate, when its terms are clear, definite, and explicit, and leave nothing open for negotiation. The case created a critical exception to the general rule that advertisements are invitations to treat, not offers. It also addressed the enforceability of conditions not stated in the original offer.
Raffles v. Wichelhaus
Raffles v. Wichelhaus, known as the 'Peerless Case,' is the foundational case on mutual mistake regarding a material term of the contract. The case established that when both parties attach different but equally reasonable meanings to an ambiguous contract term, there is no meeting of the minds and no enforceable contract exists. It is the most famous illustration of the concept of latent ambiguity in contract law.
Sherwood v. Walker
Sherwood v. Walker, the 'Barren Cow Case,' is a foundational case on mutual mistake of fact as a basis for rescinding a contract. The case established that when both parties are mistaken about a basic assumption that goes to the very nature or substance of the thing contracted for, the contract may be voidable. The distinction between mistakes going to the substance (which allow rescission) and mistakes going to mere quality or value (which do not) has been widely debated but remains influential.
Lenawee County Board of Health v. Messerly
Lenawee County v. Messerly modernized Michigan's approach to mutual mistake by departing from the substance-versus-quality distinction of Sherwood v. Walker and adopting a more flexible analysis based on the Restatement (Second) of Contracts. The court emphasized that the allocation of risk is the critical inquiry in mutual mistake cases, holding that rescission is unavailable when the risk of the mistake was allocated to one of the parties by the contract or by the circumstances.
Taylor v. Caldwell
Taylor v. Caldwell is the foundational case establishing the doctrine of impossibility of performance (frustration of contract), holding that when a contract depends on the continued existence of a specific thing, and that thing is destroyed without fault of either party, both parties are excused from performance. The case departed from the absolute liability rule of contract law and introduced an implied condition of the continued existence of the essential subject matter.
Krell v. Henry
Krell v. Henry is the foundational case on the doctrine of frustration of purpose, establishing that a contract may be discharged when an unforeseen event destroys the principal purpose for which the contract was made, even though performance remains physically possible. The case extended the impossibility doctrine of Taylor v. Caldwell to situations where the purpose, rather than the subject matter, is what ceases to exist.
Transatlantic Financing Corp. v. United States
Transatlantic Financing Corp. v. United States is a leading case on the doctrine of commercial impracticability, establishing a rigorous three-part test for when a party may be excused from performance due to unforeseen circumstances that make performance commercially impractical. The case demonstrated that mere increase in cost or difficulty of performance is generally insufficient to excuse a party under the impracticability doctrine, and significantly shaped modern impracticability analysis.
Alaska Packers' Association v. Domenico
Alaska Packers' Association v. Domenico is a foundational case on the pre-existing duty rule, establishing that a promise to pay more for performance of a duty one is already contractually obligated to perform is not supported by consideration and is therefore unenforceable. The case illustrates the problem of contractual modifications procured through economic duress or opportunistic holdup and remains a central teaching case on consideration in contract modification.
Angel v. Murray
Angel v. Murray is a landmark case that relaxed the pre-existing duty rule by holding that a contract modification may be enforceable without new consideration when it is voluntarily made in light of unanticipated changed circumstances and is fair and equitable. The case adopted the approach of the Restatement (Second) of Contracts Section 89 and represented a significant modernization of the consideration doctrine in the context of contract modification.
Mills v. Wyman
Mills v. Wyman is a foundational case on the doctrine of past consideration, establishing that a moral obligation arising from benefits previously conferred does not constitute legally sufficient consideration to enforce a subsequent promise. The case draws a clear line between moral duty and legal obligation, holding that gratitude and moral obligation alone cannot create an enforceable contract. It is one of the most important early American cases on the limits of consideration.
Webb v. McGowin
Webb v. McGowin is the leading case creating an exception to the past consideration rule, holding that a promise to compensate someone who has previously conferred a material benefit on the promisor, particularly by saving the promisor from serious bodily harm or death, may be enforceable despite the absence of a contemporaneous bargain. The case recognized the 'material benefit rule' and is frequently contrasted with Mills v. Wyman to illustrate the narrow circumstances under which moral obligation may support a promise.
Ricketts v. Scothorn
Ricketts v. Scothorn is a seminal case on promissory estoppel, establishing that a gratuitous promise may be enforced when the promisee has reasonably relied on it to her detriment, even in the absence of traditional consideration. The case was one of the earliest to apply equitable estoppel principles to enforce a promise and was a key precursor to the formal adoption of promissory estoppel in the Restatement of Contracts Section 90.
Hoffman v. Red Owl Stores, Inc.
Hoffman v. Red Owl Stores is a landmark case extending promissory estoppel beyond its traditional application to gratuitous promises, holding that reliance on promises made during preliminary negotiations can be actionable even when the parties never reach a final agreement. The case significantly expanded the reach of promissory estoppel by applying it to a pre-contractual bargaining context and established that a promise need not encompass all essential terms of a proposed transaction to be enforceable under Section 90 of the Restatement.
ProCD, Inc. v. Zeidenberg
ProCD, Inc. v. Zeidenberg is a landmark case on the enforceability of shrinkwrap licenses and rolling contracts, holding that contract terms enclosed inside a product's packaging are enforceable even though the buyer does not see them until after the purchase. Judge Easterbrook's opinion established that a contract may be formed in stages, with initial purchase followed by the buyer's opportunity to review and accept or reject the terms. The case profoundly shaped the law governing software licenses and modern consumer transactions.
Hill v. Gateway 2000, Inc.
Hill v. Gateway 2000 extended the shrinkwrap license principles of ProCD v. Zeidenberg to hardware purchases, holding that terms included inside a computer's shipping box are enforceable when the buyer has the opportunity to review the terms and return the product within a specified period. The case further solidified the 'rolling contract' or 'pay now, terms later' model of contract formation and has been particularly influential in shaping consumer transactions in the digital economy.
Torts
Palsgraf v. Long Island Railroad Co.
Palsgraf is the foundational case on proximate cause and duty in negligence law. It established that a defendant owes a duty of care only to foreseeable plaintiffs and that negligence in the air, so to speak, does not create liability to everyone harmed. The case remains the starting point for virtually every discussion of duty and proximate cause in American tort law.
Vosburg v. Putney
Vosburg v. Putney is a foundational case in intentional torts, establishing that intent to make contact — not intent to cause harm — is sufficient for battery. It also introduced the eggshell plaintiff rule in the context of intentional torts, holding that a defendant is liable for all consequences of an unlawful act, even if unforeseeable.
Garratt v. Dailey
Garratt v. Dailey is the leading case on the meaning of intent in battery, establishing that intent includes not only the desire to bring about a harmful or offensive contact but also the substantial certainty that such contact will result. This expanded definition of intent is foundational to modern intentional tort doctrine.
Brown v. Kendall
Brown v. Kendall is regarded as the foundational case in American negligence law. It shifted tort liability from strict liability for directly caused harms to a fault-based system, establishing that a plaintiff must prove the defendant failed to exercise ordinary care. This transformation laid the groundwork for modern negligence doctrine.
Butterfield v. Forrester
Butterfield v. Forrester is the foundational case establishing the doctrine of contributory negligence. It held that a plaintiff who fails to exercise ordinary care for his own safety and whose own negligence contributes to his injury cannot recover from a negligent defendant. This harsh rule dominated Anglo-American tort law for over a century.
United States v. Carroll Towing Co.
Carroll Towing is the seminal case establishing the Hand Formula (or BPL test) for determining breach of duty in negligence. Judge Learned Hand articulated the algebraic formula that a party is negligent if the burden of taking precautions (B) is less than the probability of harm (P) multiplied by the gravity of the resulting injury (L). This cost-benefit approach to negligence analysis has been enormously influential.
Byrne v. Boadle
Byrne v. Boadle is the foundational case establishing the doctrine of res ipsa loquitur ('the thing speaks for itself'). It held that in certain circumstances, the mere occurrence of an accident can create an inference of negligence, relieving the plaintiff of the burden of proving the specific negligent act. This doctrine remains a critical tool for plaintiffs who cannot identify the precise cause of their injury.
Escola v. Coca-Cola Bottling Co. of Fresno
While the majority applied res ipsa loquitur to find negligence, Justice Traynor's concurrence in Escola is famous for articulating the policy rationale for strict products liability, foreshadowing the revolution that would come two decades later in Greenman v. Yuba Power Products. The concurrence argued that manufacturers should bear the costs of injuries caused by their defective products regardless of fault.
Greenman v. Yuba Power Products, Inc.
Greenman is the landmark case that formally established strict products liability in American tort law. Justice Traynor, writing for the court, held that a manufacturer is strictly liable when it places a defective product on the market knowing it will be used without inspection. This case triggered a nationwide revolution in products liability law and led directly to the adoption of Restatement (Second) Section 402A.
MacPherson v. Buick Motor Co.
MacPherson is a landmark case that eliminated the privity of contract requirement for negligence actions against manufacturers. Judge Cardozo held that a manufacturer owes a duty of care to all foreseeable users of its products, not just those with whom it has a direct contractual relationship. This decision opened the door to modern products liability law.
Sindell v. Abbott Laboratories
Sindell established the groundbreaking market share liability theory, allowing plaintiffs to recover from multiple manufacturers of a fungible product in proportion to each manufacturer's market share, even when the plaintiff cannot identify which specific manufacturer produced the product that caused her injury. This was a creative solution to the identification problem in mass tort litigation.
Summers v. Tice
Summers v. Tice established the alternative liability theory, holding that when two or more defendants act negligently and it is impossible for the plaintiff to determine which defendant actually caused the injury, the burden of proof on causation shifts to the defendants. Each defendant must then prove that he did not cause the harm, or face joint and several liability.
Rylands v. Fletcher
Rylands v. Fletcher is the foundational case for strict liability for abnormally dangerous activities. It established the principle that a person who brings onto his land something likely to do mischief if it escapes is strictly liable for all damage that results from its escape. This case laid the groundwork for the American doctrine of strict liability for abnormally dangerous activities as developed in the Restatement of Torts.
Tarasoff v. Regents of the University of California
Tarasoff established the duty of mental health professionals to protect identifiable third parties from serious harm threatened by their patients. The court's famous holding that the protective privilege ends where the public peril begins created a landmark duty to warn or protect that has been adopted in some form by the vast majority of American jurisdictions.
BMW of North America, Inc. v. Gore
BMW v. Gore is the landmark Supreme Court case establishing constitutional limits on punitive damages under the Due Process Clause of the Fourteenth Amendment. The Court held that grossly excessive punitive damages violate due process and articulated three guideposts for evaluating whether a punitive damages award is constitutionally excessive.
Liebeck v. McDonald's Restaurants
Liebeck v. McDonald's is the most publicly discussed tort case in American history and is central to the debate over tort reform. While often cited by critics as an example of frivolous litigation, the case actually involved severe third-degree burns caused by coffee served at dangerously high temperatures, and the jury found that McDonald's was aware of the risk and chose not to reduce the temperature. The case illustrates the proper functioning of products liability and punitive damages.
Katko v. Briney
Katko v. Briney is the leading case on the limits of using force in defense of property. The court held that a property owner may not use deadly force or a device designed to inflict serious bodily harm to protect unoccupied property, even against trespassers. The sanctity of human life outweighs property interests when no person is present to be threatened.
Vincent v. Lake Erie Transportation Co.
Vincent v. Lake Erie is the foundational case on the private necessity doctrine in tort law. The court held that while a person may interfere with another's property when reasonably necessary to preserve his own property from destruction, he must compensate the property owner for any resulting damage. Necessity provides a privilege to act but does not eliminate liability for harm caused.
Hammontree v. Jenner
Hammontree v. Jenner is an important case rejecting the application of strict liability to automobile accidents. The court held that despite the analogy to products liability, the doctrine of strict liability should not be extended to automobile drivers who cause accidents due to sudden medical emergencies. Negligence remains the appropriate standard for automobile accident cases.
Ultramares Corp. v. Touche
Ultramares is the foundational case on the scope of duty in negligent misrepresentation, establishing that accountants and other professionals owe a duty only to those in privity or a relationship closely approaching privity, not to the general public. The case limited the potentially boundless liability that could arise from professional negligence, articulating the famous concern about liability 'in an indeterminate amount for an indeterminate time to an indeterminate class.'
Dillon v. Legg
Dillon v. Legg is the landmark case that first recognized the right to recover for negligent infliction of emotional distress by bystander witnesses. The court abandoned the rigid impact rule and zone of danger test in favor of a flexible foreseeability analysis based on multiple factors, opening the door for bystanders who witness injury to close relatives to recover for emotional harm.
Thing v. La Chusa
Thing v. La Chusa refined and limited the Dillon v. Legg bystander emotional distress test by converting the flexible Dillon factors into strict requirements. The court imposed bright-line rules requiring that the plaintiff be present at the scene, contemporaneously perceive the accident, and be closely related to the victim. This decision brought greater predictability to bystander emotional distress claims but at the cost of excluding some sympathetic plaintiffs.
New York Times Co. v. Sullivan
New York Times v. Sullivan is the landmark case constitutionalizing the law of defamation by establishing that the First Amendment requires public officials to prove actual malice — knowledge of falsity or reckless disregard for the truth — to recover in a defamation action. This decision profoundly reshaped American libel law and provided robust protection for press criticism of government officials.
Hustler Magazine, Inc. v. Falwell
Hustler v. Falwell extended First Amendment protections to intentional infliction of emotional distress claims brought by public figures. The Court held that public figures and public officials cannot recover for IIED based on published parody or satire unless they can also prove the publication contains a false statement of fact made with actual malice. The decision ensured that the NYT v. Sullivan framework could not be circumvented through alternative tort theories.
Snyder v. Phelps
Snyder v. Phelps held that the First Amendment protects even deeply offensive speech on matters of public concern from tort liability. The Court ruled that members of the Westboro Baptist Church could not be held liable for intentional infliction of emotional distress for their protests near a military funeral, because the speech addressed matters of public concern on public land in a peaceful manner.
Criminal Law
Regina v. Dudley and Stephens
This case established that necessity is not a defense to murder under the common law. It remains the foundational authority on the limits of the necessity defense, holding that the deliberate killing of an innocent person cannot be justified by the preservation of other lives. The decision set the moral boundary that the law does not permit individuals to decide whose life is more valuable.
People v. Newton
This case established that unconsciousness, even if caused by the defendant's own voluntary actions, can negate the voluntary act requirement for criminal liability. The decision is a key illustration of the actus reus principle that criminal liability requires a voluntary act. It expanded the understanding of involuntary conduct beyond traditional examples like sleepwalking or epileptic seizures.
Martin v. State
This case is the classic illustration of the voluntary act requirement in criminal law. It established that criminal liability requires that the defendant's appearance in the public place or the conduct constituting the offense must be voluntary. The decision demonstrated that when police officers forcibly brought the defendant onto a public highway, his subsequent public drunkenness could not be considered a voluntary act.
MPC v. Common Law Mens Rea (Doctrinal Framework)
The Model Penal Code Section 2.02 replaced the confusing and overlapping common law mens rea terms with a systematic hierarchy of four mental states: purposely, knowingly, recklessly, and negligently. This framework brought clarity and consistency to criminal law by defining each mental state precisely and establishing that recklessness is the default culpability requirement when a statute is silent. The MPC approach has been adopted in whole or in part by a majority of American jurisdictions.
People v. Conley
This case is a key teaching case for distinguishing between the MPC mental states of purpose and knowledge. The court held that intent to cause a specific result can be inferred from surrounding circumstances, including the nature of the weapon used and the manner of the attack. It clarified that under the Illinois Criminal Code (based on the MPC), a defendant acts intentionally with respect to a result when it is his conscious object to cause that result.
Regina v. Cunningham
This case established the modern definition of malice in criminal law, holding that 'maliciously' in a criminal statute requires either intention to cause the particular kind of harm or recklessness as to whether such harm would occur. It rejected the broader interpretation that malice simply means general wickedness or moral blameworthiness. The decision is a cornerstone for understanding subjective mens rea standards.
Morissette v. United States
This landmark decision established that courts should not lightly presume that Congress intended to eliminate the mens rea requirement from criminal statutes. The Court held that silence on the mental state element does not mean the legislature intended strict liability, especially for offenses that have common law antecedents. The case is the foundational authority on the presumption of a mens rea requirement in criminal law.
Staples v. United States
Staples extended the Morissette presumption of mens rea to federal firearms regulations, holding that the government must prove the defendant knew the characteristics of his weapon that brought it within the scope of the National Firearms Act. The decision reinforced that harsh penalties and the potential to criminalize seemingly innocent conduct weigh against interpreting a statute as imposing strict liability. It is a key case on the boundary between strict liability regulatory offenses and traditional crimes requiring mens rea.
People v. Acosta
This case is a key teaching case on actual (but-for) causation and proximate causation in criminal law. It examined whether a defendant who led police on a high-speed chase could be held liable for the deaths of helicopter occupants killed when two police helicopters collided while pursuing him. The case illustrates the complexities of the causation analysis when third-party actions intervene between the defendant's conduct and the harmful result.
Velazquez v. State
This case is a leading example of how an unforeseeable intervening cause can break the chain of proximate causation and relieve the defendant of criminal liability. It held that the victim's voluntary decision to engage in a dangerous drag race, combined with the unforeseeable mechanical failure of the victim's vehicle, was a superseding cause that broke the causal chain. The case is widely used to teach intervening and superseding causation.
People v. Stamp
This case is the leading authority on the felony murder rule's broad application of causation, holding that the felony murder rule imposes strict liability for any death that is a direct causal result of the felony, regardless of how foreseeable the particular manner of death was. The victim's pre-existing condition (obesity and heart disease) did not break the causal chain. The case illustrates the eggshell victim principle in the criminal law context.
People v. Patterson
This case upheld the constitutionality of placing the burden of proof on the defendant to prove the affirmative defense of extreme emotional disturbance by a preponderance of the evidence. The decision, later affirmed by the U.S. Supreme Court in Patterson v. New York, established that states may require defendants to prove affirmative defenses without violating due process, as long as the prosecution still bears the burden of proving every element of the crime beyond a reasonable doubt.
Girouard v. State
This case reaffirmed the traditional common law rule that words alone, no matter how provocative, are insufficient to constitute adequate provocation to reduce murder to voluntary manslaughter. The decision maintained the categorical approach to provocation, refusing to adopt a broader reasonableness standard. It is a key case for understanding the traditional limitations on the heat-of-passion defense.
Commonwealth v. Carroll
This case established that premeditation and deliberation for first-degree murder can occur in a very brief period of time and need not involve extended planning or reflection. The court held that no particular amount of time is necessary for the formation of the intent to kill, rejecting the defendant's argument that the killing was an impulsive act in the heat of passion. The decision represents the narrow or permissive approach to premeditation.
State v. Norman
This case addressed the limits of the self-defense doctrine in the context of battered spouse syndrome, holding that a defendant who kills her sleeping abuser is not entitled to a jury instruction on self-defense because there was no imminent threat of death or great bodily harm at the time of the killing. The decision is the leading case on the imminence requirement and its intersection with battered spouse syndrome.
People v. Goetz
This case addressed the standard for evaluating self-defense claims, holding that the New York statute requires a hybrid objective-subjective standard: the defendant must have subjectively believed deadly force was necessary, and that belief must have been objectively reasonable under the circumstances as the defendant perceived them. The case rejected a purely subjective standard for self-defense. It is one of the most famous and widely taught self-defense cases.
Tennessee v. Garner
This landmark case held that the Fourth Amendment prohibits the use of deadly force by police to prevent the escape of a fleeing felon unless the officer has probable cause to believe the suspect poses a significant threat of death or serious physical injury to the officer or others. The decision effectively abolished the common law fleeing felon rule, which had permitted police to use deadly force against any fleeing felon. It fundamentally reshaped the law governing police use of force.
In re Winship
This case established that the Due Process Clause of the Fourteenth Amendment requires the prosecution to prove every element of a criminal offense beyond a reasonable doubt. This standard, which had long been applied in federal criminal cases, was constitutionalized and made binding on the states. The decision is the foundational authority on the burden of proof in criminal cases and applies to both adult and juvenile proceedings.
Jackson v. Virginia
This case established the standard for reviewing the sufficiency of evidence in criminal cases, holding that a conviction must be sustained if, viewing the evidence in the light most favorable to the prosecution, any rational trier of fact could have found the essential elements of the crime beyond a reasonable doubt. The decision built on In re Winship by providing the framework for appellate review of whether the constitutional standard of proof has been satisfied.
Pinkerton v. United States
This case established the Pinkerton doctrine, which holds that a co-conspirator can be held liable for the substantive criminal acts of other conspirators committed in furtherance of the conspiracy, even if the defendant did not directly participate in, aid, or abet those acts and even if the defendant was not present when they were committed. The doctrine significantly expands criminal liability for conspirators and remains one of the most important and controversial doctrines in criminal law.
People v. Beardsley
This case is the leading authority on the limited scope of the duty to act in criminal law. It held that a man had no legal duty to summon medical aid for his companion who took a fatal overdose of morphine in his home, because no recognized legal relationship between them created such a duty. The case illustrates the common law's reluctance to impose criminal liability for omissions absent a specific legal duty to act.
Jones v. United States
This case established the modern framework for analyzing when a legal duty to act arises for purposes of criminal liability based on omission. The court identified four categories of situations in which a legal duty to act may be found: statute, status relationship, contractual obligation, and voluntary assumption of care. This framework has become the standard analytical tool for duty-to-act questions in criminal law.
Robinson v. California
This landmark case held that a state law criminalizing the status of being addicted to narcotics violated the Eighth Amendment's prohibition on cruel and unusual punishment, as incorporated against the states through the Fourteenth Amendment. The decision established the principle that the government cannot punish a person for a status or condition, as opposed to conduct, and is the foundational case on the constitutional limits of criminalization.
Powell v. Texas
This case declined to extend Robinson v. California's prohibition on status crimes to cover the act of being drunk in a public place. The plurality held that the defendant was not being punished for the status of alcoholism but for the specific conduct of appearing in public while intoxicated. The decision set the boundary of the status crime doctrine and established that the Constitution does not bar punishment for conduct, even if the conduct is symptomatic of or compelled by a condition or disease.
Lambert v. California
This case held that due process requires notice before criminal liability can be imposed for the failure to register under a felon registration ordinance, where the duty to register was not commonly known and there was no conduct that would alert the defendant to the registration requirement. The decision established a narrow but important exception to the general rule that ignorance of the law is no excuse, applying where a statute punishes a passive omission and the defendant had no reason to know of the legal duty.
Property
Pierson v. Post
Pierson v. Post is the foundational case on the acquisition of property rights in wild animals (ferae naturae). It established that mere pursuit of a wild animal does not create a property right; actual capture or mortal wounding is required. The case remains the starting point for virtually every Property law course in American legal education.
Johnson v. M'Intosh
Johnson v. M'Intosh established the discovery doctrine as the foundation of American property law, holding that European discovery gave the discovering nation title to the land, subject only to the Native Americans' right of occupancy. The case remains one of the most important and most criticized decisions in property law, forming the legal basis for federal authority over Native American lands. It is the foundational case for understanding how property ownership was initially distributed in the United States.
Armory v. Delamirie
Armory v. Delamirie established the foundational principle that a finder of personal property has superior title against all the world except the true owner. The case also established the evidentiary rule that when a wrongdoer fails to produce evidence within their control, the court will presume the evidence was of the highest value. It remains the leading case on finders' rights in both English and American property law.
Kelo v. City of New London
Kelo v. City of New London broadly interpreted the 'public use' requirement of the Fifth Amendment's Takings Clause, holding that economic development constitutes a valid public use justifying the exercise of eminent domain, even when the property is transferred to private parties. The decision was enormously controversial and prompted legislative reforms in over 40 states to restrict the use of eminent domain for private economic development.
Penn Central Transportation Co. v. New York City
Penn Central established the multi-factor balancing test that remains the primary framework for analyzing regulatory takings claims under the Fifth Amendment. The three Penn Central factors — economic impact on the claimant, interference with investment-backed expectations, and the character of the government action — continue to be the default test for determining when a government regulation 'goes too far' and constitutes a taking requiring just compensation.
Lucas v. South Carolina Coastal Council
Lucas established a categorical rule for regulatory takings: when a regulation deprives a property owner of all economically beneficial use of the land, it constitutes a per se taking requiring just compensation, unless the prohibited use was already restricted by background principles of nuisance or property law. The case carved out an important exception to the Penn Central balancing test for total regulatory takings.
Village of Euclid v. Ambler Realty Co.
Village of Euclid is the landmark decision establishing the constitutionality of comprehensive zoning as a valid exercise of the police power. The case upheld the power of municipalities to divide land into use districts and impose restrictions on building heights, lot sizes, and land uses. It remains the foundational case for American zoning law and land use regulation.
Shelley v. Kraemer
Shelley v. Kraemer held that judicial enforcement of racially restrictive covenants constitutes state action in violation of the Equal Protection Clause of the Fourteenth Amendment. While the Court did not invalidate the covenants themselves as private agreements, it held that courts could not enforce them. The decision was a critical precursor to the civil rights movement and fundamentally changed American housing law.
Javins v. First National Realty Corp.
Javins v. First National Realty revolutionized landlord-tenant law by recognizing an implied warranty of habitability in residential leases. The decision rejected the traditional common law property approach to leases in favor of a modern contract-based approach, holding that a landlord's failure to maintain the premises in habitable condition breaches an implied warranty that entitles tenants to withhold rent. The case transformed the legal relationship between landlords and tenants across the country.
Reste Realty Corp. v. Cooper
Reste Realty v. Cooper extended the doctrine of constructive eviction to cases where a landlord's failure to remedy a defective condition renders leased premises substantially unsuitable for the purpose for which they were leased. The case is significant for applying constructive eviction to commercial tenancies and for recognizing that a landlord's implied covenant of quiet enjoyment can be breached by conditions arising from common areas or building defects, not just by the landlord's affirmative acts.
Van Valkenburgh v. Lutz
Van Valkenburgh v. Lutz is a controversial adverse possession case that illustrates the strict requirements for establishing adverse possession, particularly the elements of hostility and claim of right. The case is frequently criticized for its seemingly harsh result and is studied for the debate it generates about what constitutes 'hostile' possession and whether a possessor must subjectively believe they own the property.
Howard v. Kunto
Howard v. Kunto established two important principles in adverse possession law: first, that seasonal use of property (such as a summer home) can satisfy the continuity requirement if it is consistent with the nature of the property; and second, that the doctrine of tacking allows successive adverse possessors in privity to combine their periods of possession to satisfy the statutory period.
Mannillo v. Gorski
Mannillo v. Gorski addressed the hostility requirement in adverse possession, holding that a mistaken belief of ownership does not defeat a claim of adverse possession. The case also established that minor encroachments may not satisfy the open and notorious requirement unless the true owner had actual knowledge of the encroachment. It is a key case for understanding how courts handle boundary disputes involving innocent encroachments.
Willard v. First Church of Christ, Scientist
Willard v. First Church of Christ, Scientist rejected the traditional common law rule that an easement cannot be reserved in favor of a third party (a stranger to the deed). The California Supreme Court held that a grantor can reserve an easement for a third party, prioritizing the intent of the parties over the ancient formalistic rule. The case represents a significant modernization of easement law.
Holbrook v. Taylor
Holbrook v. Taylor established that an irrevocable license (sometimes called an easement by estoppel) may arise when a landowner permits another to use their land, the user relies on that permission by making substantial expenditures or improvements, and it would be inequitable to revoke the permission. The case is a leading authority on the doctrine of irrevocable licenses or easements by estoppel.
Tulk v. Moxhay
Tulk v. Moxhay is the foundational case for the equitable enforcement of restrictive covenants (equitable servitudes) against subsequent purchasers who take with notice. The decision established that even when a covenant does not 'run with the land' at law, equity will enforce it against a successor who had notice of the covenant at the time of purchase. The case remains the cornerstone of equitable servitudes doctrine in both English and American law.
Neponsit Property Owners' Association v. Emigrant Industrial Savings Bank
Neponsit Property Owners' Association v. Emigrant Industrial Savings Bank upheld the enforceability of affirmative covenants requiring payment of annual assessments for the maintenance of common areas in a residential subdivision. The case is significant for its flexible interpretation of the 'touch and concern' requirement and for recognizing a homeowner association's standing to enforce covenants, even though the association did not own land benefited by the covenant.
Sanborn v. McLean
Sanborn v. McLean established the doctrine of implied reciprocal negative easements (also called implied equitable servitudes from a common scheme), holding that when a developer sells lots subject to a common plan of restrictions, the restrictions may be implied on lots whose deeds do not contain express restrictive covenants. The case also established that the visible residential character of a neighborhood can constitute inquiry notice of the restrictions.
Nahrstedt v. Lakeside Village Condominium Association
Nahrstedt v. Lakeside Village established the standard for reviewing CC&Rs (covenants, conditions, and restrictions) in common interest developments, holding that recorded CC&Rs are presumptively valid and will be enforced unless they are wholly arbitrary, violate fundamental public policy, or impose a burden that far outweighs any benefit. The case is the leading authority on the enforcement of homeowner association restrictions.
Johnson v. Davis
Johnson v. Davis abrogated the doctrine of caveat emptor in real estate transactions, holding that sellers of residential property have a duty to disclose known material defects that are not readily observable by the buyer. The case established a disclosure duty that has been widely adopted across jurisdictions and fundamentally changed the obligations of sellers in residential real estate sales.
Stambovsky v. Ackley
Stambovsky v. Ackley, famously known as the 'Ghostbusters' case, held that a seller who has created or is responsible for a condition materially affecting the value of the property (in this case, a reputation for being haunted) has a duty to disclose that condition to an out-of-town buyer who could not reasonably be expected to know about it. The case applied equitable principles to override the doctrine of caveat emptor in circumstances involving unique, non-physical defects.
Lohmeyer v. Bower
Lohmeyer v. Bower established that a buyer may rescind a real estate contract when the seller cannot deliver marketable title due to existing zoning or restrictive covenant violations on the property. The case clarified that marketable title requires not only a clear chain of title but also freedom from encumbrances that render the property unusable or expose the buyer to litigation.
Bean v. Walker
Bean v. Walker addressed the rights of buyers under installment land contracts (contracts for deed), holding that a defaulting buyer who has paid a substantial portion of the purchase price is entitled to equitable relief from forfeiture. The case protects buyers in installment contracts from the harsh consequence of total forfeiture after making substantial payments, treating the buyer's equity in the property as a protected interest.
Murphy v. Financial Development Corp.
Murphy v. Financial Development Corp. established that a mortgagee exercising a power of sale in a foreclosure must act in good faith and use reasonable diligence to obtain a fair price for the property. The case imposed a duty of care on foreclosing mortgagees, moving beyond the traditional rule that allowed mortgagees to sell the property at any price so long as the statutory procedures were followed.
State v. Shack
State v. Shack held that the rights of property owners are not absolute and must yield when they conflict with the fundamental rights of others. The case established that migrant farmworkers have a right to receive visitors providing essential services — including legal aid and medical care — on the employer's property, and that a property owner cannot invoke trespass law to deny workers access to such services. It is a foundational case on the limits of property rights.
Evidence
Daubert v. Merrell Dow Pharmaceuticals, Inc.
Daubert replaced the longstanding Frye 'general acceptance' test with a more flexible, multi-factor framework for determining the admissibility of expert scientific testimony under Federal Rule of Evidence 702. The decision assigned trial judges a gatekeeping role to ensure that expert testimony is both relevant and reliable. It fundamentally reshaped the landscape of scientific evidence in federal courts.
Frye v. United States
Frye established the 'general acceptance' test for the admissibility of scientific evidence, which dominated American evidence law for seventy years. The standard required that a scientific technique be generally accepted in the relevant scientific community before it could be admitted as evidence. Although superseded in federal courts by Daubert, the Frye test remains the standard in several states.
Crawford v. Washington
Crawford revolutionized Confrontation Clause jurisprudence by holding that the Sixth Amendment bars the admission of testimonial hearsay unless the declarant is unavailable and the defendant had a prior opportunity to cross-examine. The decision overruled Ohio v. Roberts and its reliability-based framework, returning to the original meaning of the Confrontation Clause as understood by the Framers.
Davis v. Washington
Davis clarified Crawford's testimonial framework by establishing the 'primary purpose' test for distinguishing testimonial from nontestimonial statements made during police interrogations. The decision held that statements are nontestimonial when made during an ongoing emergency and become testimonial when the primary purpose shifts to establishing facts for later criminal prosecution.
Ohio v. Roberts
Ohio v. Roberts established a two-part test for the Confrontation Clause that governed for nearly a quarter century: an out-of-court statement was admissible if the declarant was unavailable and the statement bore adequate 'indicia of reliability,' either by falling within a firmly rooted hearsay exception or showing particularized guarantees of trustworthiness. Although overruled by Crawford, Roberts remains important for understanding the evolution of confrontation law.
Bruton v. United States
Bruton established that in a joint trial, the admission of a non-testifying co-defendant's confession that implicates the defendant violates the defendant's Sixth Amendment right to confrontation, even when the jury is instructed to consider the confession only against the co-defendant. The decision recognized the practical limits of limiting instructions in the face of powerfully incriminating evidence.
Mutual Life Insurance Co. v. Hillmon
Hillmon established the 'state of mind' exception to the hearsay rule, holding that a declarant's statements of intent or plan are admissible to prove that the declarant subsequently acted in accordance with that stated intention. This principle was later codified in Federal Rule of Evidence 803(3) and remains one of the most important and frequently tested hearsay exceptions.
Tome v. United States
Tome resolved a circuit split on the temporal requirement for prior consistent statements under Federal Rule of Evidence 801(d)(1)(B). The Court held that a prior consistent statement is admissible to rebut a charge of recent fabrication or improper motive only if the statement was made before the alleged motive to fabricate arose, thereby preserving the pre-Rules common law premotive requirement.
Old Chief v. United States
Old Chief addressed the application of Federal Rule of Evidence 403 when a defendant offers to stipulate to a prior conviction that is an element of the charged offense. The Court held that where the risk of unfair prejudice from the name and nature of a prior conviction substantially outweighs its probative value, and the defendant offers to stipulate to the fact of a prior conviction, the trial court abuses its discretion by refusing the stipulation. The case is a landmark on the Rule 403 balancing test.
Huddleston v. United States
Huddleston resolved the standard of proof required before a trial court may admit evidence of other crimes, wrongs, or acts under Federal Rule of Evidence 404(b). The Court held that such evidence need not be proven by a preponderance of the evidence or clear and convincing evidence; rather, the trial court need only determine that a jury could reasonably find the conditional fact by a preponderance of the evidence under the Rule 104(b) standard.
Williamson v. United States
Williamson narrowly construed the hearsay exception for statements against interest under Federal Rule of Evidence 804(b)(3). The Court held that the exception applies only to those specific statements within a broader narrative that are individually self-inculpatory, not to the entire narrative that contains some self-inculpatory remarks. The decision addressed the particular danger that declarants may shift blame to others while appearing to confess.
Idaho v. Wright
Idaho v. Wright addressed the Confrontation Clause requirements for hearsay admitted under residual or catch-all exceptions. The Court held that when hearsay is admitted under an exception that is not 'firmly rooted,' the statement must possess particularized guarantees of trustworthiness derived from the totality of the circumstances surrounding the making of the statement, not from corroborating evidence. Although decided under the now-overruled Roberts framework, its analysis of reliability remains influential.
Palmer v. Hoffman
Palmer v. Hoffman is the foundational case limiting the business records exception by establishing that documents prepared primarily in anticipation of litigation, rather than in the regular course of business, are not admissible as business records. The decision introduced the critical distinction between records made for business purposes and those made for litigation purposes.
Johnson v. Lutz
Johnson v. Lutz is a seminal case establishing that business records are inadmissible hearsay when they incorporate information from persons who are not part of the business and have no business duty to report. The decision clarified that the reliability rationale for the business records exception requires that every link in the chain of information come from someone within the business organization acting under a business duty.
United States v. Zenni
United States v. Zenni is the leading case on implied assertions and the definition of hearsay under the Federal Rules of Evidence. The court held that implied assertions -- conduct or statements from which an assertion can be inferred but which were not intended as assertions -- are not hearsay under the Federal Rules, breaking from the common law approach of Wright v. Doe d. Tatham.
Bourjaily v. United States
Bourjaily established two important principles for the co-conspirator hearsay exception under Federal Rule of Evidence 801(d)(2)(E). First, the court may consider the contents of the proffered statement itself in determining whether the foundational requirements of the exception are met. Second, the existence of a conspiracy and the declarant's and defendant's participation in it must be established by a preponderance of the evidence under Rule 104(a).
Trammel v. United States
Trammel modified the spousal testimonial privilege by holding that the witness-spouse alone holds the privilege to refuse to testify adversely against the other spouse. Previously, either spouse could invoke the privilege, effectively giving the defendant-spouse veto power over the other spouse's testimony. The decision reflects the Court's view that when a spouse is willing to testify, the marriage is likely already damaged, and the privilege should not be used to suppress relevant evidence.
Upjohn Co. v. United States
Upjohn rejected the narrow 'control group' test for the corporate attorney-client privilege and held that the privilege extends to communications between corporate counsel and lower-level employees when made for the purpose of obtaining legal advice for the corporation. The decision also clarified the scope of the work-product doctrine as applied to attorney interview memoranda in corporate investigations.
Swidler & Berlin v. United States
Swidler & Berlin held that the attorney-client privilege survives the death of the client. The decision rejected arguments that the privilege should yield after death when the communications are relevant to a criminal investigation. The case arose from the investigation into the death of White House Deputy Counsel Vincent Foster and was widely followed for its implications for the scope and duration of the attorney-client privilege.
Chambers v. Mississippi
Chambers established that state evidentiary rules cannot be applied so rigidly as to deny a criminal defendant a fair opportunity to present a defense, as guaranteed by the Due Process Clause of the Fourteenth Amendment. The decision recognized a constitutional right to present defense evidence that may override otherwise valid hearsay and voucher rules.
Rock v. Arkansas
Rock v. Arkansas held that a per se rule excluding all hypnotically refreshed testimony of a criminal defendant violates the defendant's constitutional right to testify on her own behalf. The decision established that the right to testify is a fundamental right under the Due Process Clause, the Compulsory Process Clause, and the Fifth Amendment, and that restrictions on this right must be evaluated individually rather than through blanket prohibitions.
Green v. Bock Laundry Machine Co.
Green v. Bock Laundry resolved the question of whether Federal Rule of Evidence 609(a)(1), which allows impeachment by prior felony convictions subject to a Rule 403 balancing test, applies in civil cases and criminal cases where the government calls a witness with a prior conviction. The Court held that the Rule 403 balancing test in Rule 609(a)(1) applies only to protect criminal defendants, not civil litigants or the government in criminal cases.
Luce v. United States
Luce established the requirement that a defendant must testify at trial in order to preserve for appellate review a claim that the trial court erroneously ruled that a prior conviction could be used for impeachment. The decision created a practical prerequisite for challenging Rule 609 rulings on appeal, reflecting the Court's view that appellate review requires a complete record.
Beech Aircraft Corp. v. Rainey
Beech Aircraft held that Federal Rule of Evidence 803(8)(C), the public records exception for investigative reports, encompasses factual findings that include opinions and conclusions, not just narrow statements of observed fact. The decision also addressed the rule of completeness under Rule 106. It broadened the scope of admissible government investigative reports.
Kumho Tire Co. v. Carmichael
Kumho Tire extended the Daubert gatekeeping framework beyond scientific expert testimony to encompass all expert testimony, including testimony based on technical and other specialized knowledge. The decision completed the Daubert trilogy and confirmed that trial courts have broad discretion in determining how to assess the reliability of expert testimony under Rule 702.