What Is Stare Decisis?
The principle that courts should follow previous decisions when deciding similar cases. It is what makes 'precedent' binding — once a higher court decides an issue, lower courts in the same system must follow that ruling.
Quick Answer
The principle that courts should follow previous decisions when deciding similar cases. It is what makes 'precedent' binding — once a higher court decides an issue, lower courts in the same system must follow that ruling.
Full Explanation
Stare decisis is Latin for 'to stand by things decided.' It is the foundation of the common law system and the reason that prior court decisions — called precedents — have legal force. When a court has decided a legal question, other courts facing the same question are expected to reach the same result.
The doctrine operates vertically: decisions by higher courts bind lower courts in the same jurisdiction. A U.S. Supreme Court ruling on a constitutional question binds every court in the country. A state supreme court ruling binds all courts in that state. Decisions by courts of equal rank or from other jurisdictions are 'persuasive' but not binding.
Stare decisis also operates horizontally, though more loosely: a court will generally follow its own prior decisions. However, courts — especially the Supreme Court — can overturn their own precedents when they believe a prior ruling was wrong or when society has changed significantly. The Supreme Court laid out factors for overruling precedent in cases like Planned Parenthood v. Casey (1992) and Dobbs v. Jackson Women's Health Organization (2022).
Courts distinguish cases rather than overrule them when they find meaningful factual differences between the current case and the precedent. This 'distinguishing' allows flexibility without formally abandoning the rule.
Real-World Example
Brown v. Board of Education (1954) is one of the most famous examples of overruling precedent. The Supreme Court reversed Plessy v. Ferguson (1896), which had upheld 'separate but equal' racial segregation. The Court found the prior ruling was wrong as a matter of constitutional law and inconsistent with the reality of segregation.
On the other hand, in Citizens United v. FEC (2010), the Supreme Court distinguished and overruled prior campaign finance precedents, holding that corporations have First Amendment rights to spend money in elections.
Why It Matters for Law Students
Stare decisis is one of the most fundamental concepts in American law. It provides predictability — people can plan their conduct based on established rules. It promotes equality — similar cases should be treated similarly. And it constrains judicial power — judges cannot simply decide cases based on personal preference. Understanding when precedent is binding versus merely persuasive is essential for every law student.