--- title: "Relevance (FRE 401-403)" type: Legal Rule source: https://casebriefly.com/legal-rules/relevance-fre-401-403 --- # Relevance (FRE 401-403) Evidence is relevant if it has any tendency to make a fact of consequence more or less probable. Relevant evidence is generally admissible unless its probative value is substantially outweighed by unfair prejudice or other concerns. ## Definition Relevance is the foundational gatekeeping concept in the law of evidence, governed by Federal Rules of Evidence 401 through 403. Under FRE 401, evidence is relevant if it has any tendency to make a fact more or less probable than it would be without the evidence, and the fact is of consequence in determining the action. This is an intentionally low threshold — the evidence need not conclusively prove anything; it must merely nudge the probability in one direction. FRE 402 establishes the baseline principle that all relevant evidence is admissible unless excluded by the Constitution, a federal statute, the Federal Rules of Evidence, or other Supreme Court rules. Conversely, irrelevant evidence is never admissible. This creates a presumption of admissibility for relevant evidence. FRE 403 provides the critical counterbalance: a court may exclude relevant evidence if its probative value is substantially outweighed by the danger of unfair prejudice, confusing the issues, misleading the jury, undue delay, wasting time, or needlessly presenting cumulative evidence. The rule intentionally tilts toward admissibility — the prejudice must substantially outweigh probative value, not merely equal it. Trial judges have broad discretion under Rule 403 and are rarely reversed on appeal. Mastering the interplay between Rules 401 and 403 is essential because virtually every evidence question begins with relevance analysis. ## Elements - The evidence must have any tendency to make a fact more or less probable (FRE 401(a)) - The fact must be of consequence in determining the action (FRE 401(b)) - Relevant evidence is generally admissible (FRE 402) - Irrelevant evidence is not admissible (FRE 402) - Relevant evidence may be excluded if probative value is substantially outweighed by danger of unfair prejudice (FRE 403) - Other FRE 403 dangers include confusion of the issues, misleading the jury, undue delay, or needless cumulative evidence ## Key Case Old Chief v. United States, 519 U.S. 172 (1997) ## Landmark Cases | Name | Citation | Significance | | --- | --- | --- | | Old Chief v. United States | 519 U.S. 172 (1997) | Held that a court must consider the availability of less prejudicial alternative proof when conducting FRE 403 balancing, particularly for prior felony convictions as an element of a charge. | | Sprint/United Management Co. v. Mendelsohn | 552 U.S. 379 (2008) | Reaffirmed that FRE 403 determinations are committed to the sound discretion of the trial court and reviewed for abuse of discretion. | | Daubert v. Merrell Dow Pharmaceuticals, Inc. | 509 U.S. 579 (1993) | Established that relevance under FRE 401-402 is a necessary but not sufficient condition for admissibility of expert testimony. | | Knapp v. State | 168 Ind. 153 (1907) | Classic case demonstrating that evidence is relevant based on the purpose for which it is offered, illustrating conditional relevance principles. | ## Exam Tips - Always start your evidence analysis with relevance under FRE 401 — it is the threshold question for every piece of evidence. - Remember that FRE 403 balancing is tilted toward admission: probative value must be SUBSTANTIALLY outweighed, not merely outweighed. - When applying FRE 403, identify the specific danger (prejudice, confusion, delay) and explain why it substantially outweighs probative value. - Distinguish unfair prejudice from mere damage to an opponent's case — all effective evidence is prejudicial, but only unfair prejudice triggers FRE 403. ## Common Mistakes - Confusing 'prejudice' with 'unfair prejudice' — FRE 403 only excludes evidence when there is unfair prejudice, not when evidence simply hurts the opposing party's case. - Applying the wrong standard by saying probative value is 'outweighed' rather than 'substantially outweighed' — the word 'substantially' is critical and tilts the balance toward admissibility. - Forgetting that relevance is a very low bar — evidence need not be conclusive or even strong, it must merely have 'any tendency' to affect probability. ## Mnemonic Or Memory Aid 401 asks 'Does it matter and does it help?' 403 asks 'Is the help worth the harm?' ## Related Rules - character-evidence-rule-fre-404 - prior-bad-acts-fre-404b - subsequent-remedial-measures-fre-407 - settlement-offers-fre-408 --- Source: [Relevance (FRE 401-403) — CaseBriefly](https://casebriefly.com/legal-rules/relevance-fre-401-403)