Huddleston v. United States, 485 U.S. 681 (U.S. Supreme Court 1988)
Huddleston v. United States is the Supreme Court's cornerstone decision on the admissibility of other-acts evidence under Federal Rule of Evidence 404(b).
Under the Federal Rules of Evidence, must a trial court find by a preponderance of the evidence that a defendant committed the other act before admitting other-acts evidence under Rule 404(b), or is it sufficient under Rule 104(b) that the jury could reasonably find the conditional fact by a preponderance?
Other-acts evidence under Federal Rule of Evidence 404(b) is admissible if: (1) it is offered for a proper, non-propensity purpose (such as proving motive, opportunity, intent, preparation, plan, knowledge, identity, absence of mistake, or lack of accident); (2) it is relevant under Rules 401/402; (3) under Rule 104(b)'s conditional relevance standard, there is sufficient evidence for a reasonable jury to find by a preponderance that the other act occurred and that the defendant was the actor (the judge need not personally find the act by a preponderance under Rule 104(a)); and (4) under Rule 403, the probative value is not substantially outweighed by the danger of unfair prejudice or other countervailing considerations. If requested, the court must give a limiting instruction under Rule 105.
A trial court is not required to make a preliminary finding by a preponderance of the evidence that the defendant committed the other act before admitting Rule 404(b) evidence. Instead, under Rule 104(b), the evidence is admissible if there is sufficient evidence from which a reasonable jury could find that the other act occurred and that the defendant was the actor. The conviction was reinstated.
Huddleston is the leading case on the admissibility of other-acts evidence under Rule 404(b). It clarifies that the sufficiency standard of Rule 104(b)—not a judicial preponderance finding under Rule 104(a)—governs the preliminary question whether the other act occurred and involved the defendant. The decision supplies the canonical, stepwise analysis for 404(b) issues: proper purpose, relevance, sufficiency for a jury finding, Rule 403 balancing, and a limiting instruction on request. For students and practitioners, Huddleston is essential for briefing and litigating motions concerning character/propensity risks, and it remains a staple of evidence law exams and practice.