180
Opinion of the Court
B
The principal issue is the scope of a trial judge's discretion under Rule 403, which authorizes exclusion of relevant evidence when its "probative value is substantially outweighed by the danger of unfair prejudice, confusion of the issues, or misleading the jury, or by considerations of undue delay, waste of time, or needless presentation of cumulative evidence." Fed. Rule Evid. 403. Old Chief relies on the danger of unfair prejudice.5
1
The term "unfair prejudice," as to a criminal defendant, speaks to the capacity of some concededly relevant evidence to lure the factfinder into declaring guilt on a ground different from proof specific to the offense charged. See generally 1 J. Weinstein, M. Berger, & J. McLaughlin, Weinstein's Evidence ¶ 403[03] (1996) (discussing the meaning of "unfair prejudice" under Rule 403). So, the Committee Notes to Rule 403 explain, " 'Unfair prejudice' within its context means an undue tendency to suggest decision on an improper basis, commonly, though not necessarily, an emotional one." Advisory Committee's Notes on Fed. Rule Evid. 403, 28 U. S. C. App., p. 860.
Such improper grounds certainly include the one that Old
Chief points to here: generalizing a defendant's earlier bad act into bad character and taking that as raising the odds that he did the later bad act now charged (or, worse, as call-the meaning of Rule 401, and others irrelevant and inadmissible under Rule 402.
5 Petitioner also suggests that we might find a prosecutor's refusal to accept an adequate stipulation and jury instruction in the narrow context presented by this case to be prosecutorial misconduct. The argument is that, since a prosecutor is charged with the pursuit of just convictions, not victory by fair means or foul, any ethical prosecutor must agree to stipulate in the situation here. But any ethical obligation will depend on the construction of Rule 403, and we have no reason to anticipate related ethical lapses once the meaning of the Rule is settled.
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