American Fork City v. Thayne, 279 P.3d 840

After a minor traffic accident at a stop light, Jessica and her mother Susan Thayne were involved while both vehicles were stopped.
The other driver, the investigating officer, and both Thaynes testified at a bench trial; 911 calls by Jessica and the other driver were admitted into evidence.
The other driver testified that Jessica and Susan approached, yelled expletives, and frightened her; Jessica denied approaching or speaking to the driver.
The district court found Jessica not credible and inconsistent with other evidence, credited the other driver, and rejected a claim that the 911 recording had been tampered with.
The district court credited the other driver’s testimony and found neither Thayne credible; the court concluded disorderly conduct and imposed an infraction; the appellate court deferred to credibility findings and affirmed.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Whether the evidence supports the disorderly conduct conviction	Thayne argues credibility issues undermine the verdict	American Fork contends the other driver’s testimony and 911 recordings are credible and sufficient	Yes, the conviction affirmed

State v. Larsen, 999 P.2d 1252 (Utah 2000) (deference to trial court credibility)
State v. Goodman, 763 P.2d 786 (Utah 1988) (trial court credibility determinations respected)
State v. Nichols, 76 P.3d 1173 (Utah 2003) (defers to trial court credibility findings)
State v. Davie, 264 P.3d 770 (Utah App. 2011) (memorable decision; credibility review guidance)