When does failure to preserve evidence violate due process in Utah criminal cases? State v. Mendoza Explained

In State v. Mendoza, the Utah Court of Appeals addressed two critical issues in criminal defense: when the State’s failure to preserve evidence violates due process and the standards for establishing juror misconduct warranting a new trial.

Background and Facts

Mendoza fatally shot Salazar at a party after an altercation. Salazar was wearing gardening gloves when shot, and witnesses observed him in a fighting stance pulling at his waistband, though no one saw him holding a gun. EMTs photographed one glove on the ambulance floor but failed to collect the gloves as evidence. During jury deliberations, a man claiming to be a juror’s husband appeared outside the courthouse, allegedly stating his wife was “terrified” because she was on a “big gang case” and expressing concern about the deliberations’ length.

Key Legal Issues

The court addressed two primary issues: (1) whether the State’s failure to preserve Salazar’s gloves violated Mendoza’s due process rights under the State v. Tiedemann framework, and (2) whether alleged juror misconduct warranted a new trial under Utah Rule of Criminal Procedure 24(a).

Court’s Analysis and Holding

The court affirmed Mendoza’s convictions on both issues. Regarding the gloves, the court applied the Tiedemann test, which requires defendants to establish a reasonable probability that lost evidence would have been exculpatory. The court found Tiedemann inapplicable because “the gloves were never possessed by the State.” Additionally, Mendoza’s theory that the gloves would show Salazar had a gun was “pure speculation” since no witness saw Salazar armed.

For the juror misconduct claim, the court found the allegations “highly circumstantial” and requiring “a huge inferential leap.” The court noted that gang-related aspects were observable in the courtroom through Mendoza’s tattoos and hand gestures in trial photos, and that the juror’s husband could have learned about gang connections independently.

Practice Implications

This decision reinforces that due process violations for lost evidence require actual State possession of the evidence. Defense counsel must establish more than speculation about potentially exculpatory value. For juror misconduct claims, courts require concrete evidence rather than inferential leaps, and jurors are presumed to follow court instructions absent clear evidence to the contrary.