Can prior sexual assault allegations be admitted to rebut a fabrication defense? State v. Murphy Explained

The Utah Court of Appeals in State v. Murphy addressed the complex intersection of Rule 404(b) evidence and the doctrine of chances in sexual assault prosecutions. The case demonstrates how Utah courts apply probability reasoning to overcome the general prohibition against character evidence.

Background and Facts

Murphy was convicted of violently sexually assaulting his wife in 2009, including aggravated sexual assault, aggravated kidnapping, forcible sexual abuse, and aggravated assault. The State sought to introduce evidence of three additional sexual assault allegations made by other women spanning sixteen years and three states. Murphy claimed self-defense and argued that his wife fabricated her account of the assault.

Key Legal Issues

The primary issue was whether the trial court properly admitted the 404(b) evidence under the doctrine of chances to rebut Murphy’s fabrication defense. The court also addressed Murphy’s motions for mistrial and claims of ineffective assistance of counsel. Murphy argued that the evidence was unfairly prejudicial under Rule 403 and that the jury was confused about the purpose of the evidence.

Court’s Analysis and Holding

The Court of Appeals applied the three-step analysis required for 404(b) evidence: relevance, proper non-character purpose, and Rule 403 balancing. The court found that the doctrine of chances properly applied to rebut the fabrication defense, noting that multiple similar allegations made it statistically unlikely that all were false. The State’s expert testified that the probability of being falsely accused of sexual assault five times was one in thirty-two quadrillion. The court concluded that the trial court’s Rule 403 analysis was not an abuse of discretion, particularly given limiting instructions to the jury.

Practice Implications

This decision reinforces Utah’s broad application of the doctrine of chances in sexual assault cases, even when used to rebut fabrication defenses. However, Judge Harris’s lengthy concurrence expresses significant reservations about this application, questioning whether it effectively circumvents the traditional prohibition against propensity evidence and conflicts with Utah’s rule against using probability evidence to establish witness credibility. Practitioners should be prepared for potential future developments in this area of law, particularly given the tension between Utah’s approach and traditional evidentiary principles.