Also known as:uncharged misconducts · prior uncharged acts · uncharged bad acts
Written by attorneys · grounded in primary & secondary sources — see below
Prior acts of misconduct by a defendant that were never charged as crimes in the pending case. Such evidence may be offered under Federal Rule of Evidence 404(b) for a non-propensity purpose such as motive, intent, identity, or absence of mistake when there is sufficient evidence for a reasonable jury to find that the defendant committed the prior act and the probative value on the permitted issue is not substantially outweighed by the danger of unfair prejudice.
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Cases
Casebooks
How it applies
Common Examples
2
Prior Data Alteration Offered for Intent
Uma Underwood, director of operations at GreenEarth Waste, faces federal charges for falsifying groundwater reports. The prosecutor offers evidence that Uma allegedly altered soil-sample data at a prior consulting job, supported by an anonymous whistleblower email and mismatched lab reports. The trial court admits the evidence after determining that a reasonable jury could find Uma committed the prior act and that its value for proving intent is not substantially outweighed by unfair prejudice. The jury may therefore consider the evidence on the question of intent while receiving a limiting instruction.
Prior Sabotage Evidence for Motive
Umar Usmani, a supervisor at Alpha Metal, is indicted for sabotaging equipment at Grove Assembly during a labor dispute. The government seeks to introduce evidence that Umar previously tampered with machinery at Alpha Metal using identical methods during union negotiations, based on co-worker observations and maintenance logs. The court admits the evidence after finding that a reasonable jury could conclude Umar committed the prior act and that its probative value on motive is not substantially outweighed by unfair prejudice. The jury may therefore evaluate the evidence for the permitted purpose of motive.
United States v. Owens484 U.S. 554, 559-560 (1988)
Common questions
Frequently Asked
4
Must the trial judge first find by a preponderance that the defendant committed the uncharged act before admitting the evidence?+
No. The trial court need not make a preliminary finding that the government proved the prior act by a preponderance of the evidence. The judge instead applies the conditional relevance standard of Rule 104(b) and asks only whether there is sufficient evidence from which a reasonable jury could find that the defendant committed the prior act.
Is a prior conviction required before uncharged misconduct may be admitted under Rule 404(b)?+
No. The rule permits evidence of other crimes, wrongs, or acts even if the conduct was never charged or resulted in no conviction, provided the conditional relevance and Rule 403 standards are satisfied.
What non-propensity purposes commonly support admission of uncharged misconduct?+
Common permissible purposes include proving motive, intent, common plan or scheme, knowledge, identity, and absence of mistake or accident. The prosecution must articulate a proper purpose and the evidence must survive Rule 403 balancing.
How does Rule 403 interact with the admission of uncharged misconduct?+
Even when offered for a proper non-propensity purpose, the evidence is admissible only if its probative value on that issue is not substantially outweighed by the danger of unfair prejudice, confusion of the issues, or misleading the jury. Courts often consider the availability of a limiting instruction in performing this balance.
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EvidenceRelevancy and reasons for excluding relevant evidence · Character and related conceptsUBEIntermediate