When does an inadvertent witness statement warrant a mistrial in Utah criminal cases? State v. Whytock Explained

In State v. Whytock, the Utah Court of Appeals addressed whether a trial court abused its discretion in denying a mistrial motion after a witness inadvertently disclosed the defendant’s criminal history, and whether trial counsel rendered ineffective assistance on witness tampering jury unanimity issues.

Background and Facts

Donnald Lee Whytock was charged with rape and witness tampering after allegedly sexually assaulting his girlfriend’s 14-year-old daughter and threatening her to remain silent. During trial, the court had ruled that no evidence of Whytock’s criminal history would be admitted. However, when the victim’s mother testified, she inadvertently stated that she had gotten Whytock “out on ankle monitor” from the Salt Lake County Jail. Defense counsel immediately moved for a mistrial, which the trial court denied.

Key Legal Issues

The case presented two main issues: (1) whether the trial court abused its discretion in denying the mistrial motion after the inadvertent disclosure, and (2) whether trial counsel rendered ineffective assistance by failing to address jury unanimity problems with the witness tampering charge, where evidence supported two separate acts but only one count was charged.

Court’s Analysis and Holding

The court affirmed both convictions. On the mistrial issue, the court applied the standard that a mistrial should be granted only where circumstances indicate a fair trial cannot be had. The court found the mother’s statement was not intentionally elicited, was made in passing, was relatively innocuous given other evidence of Whytock’s criminal activity, and the State made no further reference to it. Regarding ineffective assistance, while acknowledging a potential jury unanimity problem existed, the court found that counsel’s strategic decisions not to seek clarification of charges or object to certain evidence were reasonable, as such actions could have prompted the State to file additional charges.

Practice Implications

This decision reinforces that Utah courts grant significant deference to trial court mistrial decisions and that inadvertent, brief references to a defendant’s criminal history will not automatically warrant a mistrial, especially when cumulative of other admitted evidence. For defense practitioners, the case highlights the strategic complexity of addressing charging ambiguities—seeking clarification may backfire by prompting prosecutors to file additional charges rather than clarifying existing ones.