United States v. Mound

United States Court of Appeals for the Eighth Circuit · 1998 · Evidence

149 F.3d 799 (8th Cir. 1998)

Updated August 22, 2026

EvidenceRule 413Rule 403Rule 404(b)prior sexual assaultpropensity evidencedue processequal protection

Facts

The government charged Mound with physically and sexually abusing his daughter from 1993 through January 1997, including forced touching, intercourse, and beatings. At trial, the government sought to introduce evidence that Mound had committed similar acts in 1987 involving two girls ages 12 and 16. Mound had pleaded guilty to the first 1987 offense, and the government had dropped its investigation of the second. The district court admitted the prior conviction under Rule 413 but excluded evidence of the uncharged offense under Rule 403, and it gave the jury a cautionary instruction before the conviction was introduced.

Issue

Whether Federal Rule of Evidence 413, which allows admission of a defendant's other sexual-assault offenses in a sexual-assault prosecution, violates due process or equal protection, and whether the district court abused its discretion by admitting Mound's prior conviction under Rules 413 and 403.

Rule

Rule 413 makes evidence of a defendant's commission of another sexual-assault offense admissible in a criminal sexual-assault case for any relevant matter, but the trial court must still apply Rule 403 in a manner that allows Rule 413's intended effect. Subject to Rule 403's constraints, Rule 413 does not violate due process, and because sex-offense defendants are not a suspect class and no fundamental right is burdened, the rule satisfies equal protection if it bears a rational relation to a legitimate end. Evidence admissible under Rule 413 may be admitted even if it would be inadmissible under Rule 404(b), because Congress intended Rule 413 to supersede Rule 404(b)'s restrictive aspects in sex-offense cases.

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One of 10 multiple-choice questions for this case. Pick an answer to see why.

In federal court in Omaha, Noah Bender is tried for sexual assault. The prosecution offers proof that eight years earlier he committed another sexual assault, and the judge admits it after expressly finding under Rule 403 that the evidence is highly probative and not unfairly prejudicial.

Bender argues on appeal that admitting prior sexual-assault evidence for propensity purposes necessarily violates due process because it allows conviction based on character. How should the court rule?

Explanation. The majority held that Rule 413 does not violate due process so long as the trial court still applies Rule 403. The due process inquiry is whether admission of this type of evidence is so extremely unfair that it violates fundamental conceptions of justice. The court concluded it does not, especially because Rule 403 remains a safeguard. (Derived from United States v. Mound (1998).)