Old Chief v. United States, 519 U.S. 172, 10 (1997)

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Cite as: 519 U. S. 172 (1997)

Opinion of the Court

ing for preventive conviction even if he should happen to be innocent momentarily). As then-Judge Breyer put it, "Although . . . 'propensity evidence' is relevant, the risk that a jury will convict for crimes other than those charged—or that, uncertain of guilt, it will convict anyway because a bad person deserves punishment—creates a prejudicial effect that outweighs ordinary relevance." United States v. Moccia, 681 F. 2d 61, 63 (CA1 1982). Justice Jackson described how the law has handled this risk:

"Courts that follow the common-law tradition almost unanimously have come to disallow resort by the prosecution to any kind of evidence of a defendant's evil character to establish a probability of his guilt. Not that the law invests the defendant with a presumption of good character, Greer v. United States, 245 U. S. 559, but it simply closes the whole matter of character, disposition and reputation on the prosecution's case-in-chief. The state may not show defendant's prior trouble with the law, specific criminal acts, or ill name among his neighbors, even though such facts might logically be persuasive that he is by propensity a probable perpetrator of the crime. The inquiry is not rejected because character is irrelevant; on the contrary, it is said to weigh too much with the jury and to so overpersuade them as to prejudge one with a bad general record and deny him a fair opportunity to defend against a particular charge. The overriding policy of excluding such evidence, despite its admitted probative value, is the practical experience that its disallowance tends to prevent confusion of issues, unfair surprise and undue prejudice." Michelson v. United States, 335 U. S. 469, 475-476 (1948) (footnotes omitted).

Rule of Evidence 404(b) reflects this common-law tradition by addressing propensity reasoning directly: "Evidence of other crimes, wrongs, or acts is not admissible to prove the

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