Monday, September 29, 2025

Probable Cause in DUI Case: State v. Dutton

 The Utah Court of Appeals has given a helpful analysis of probable cause as it relates to DUI cases. 

Facts: 

Defendant drove to the bank and bank employees called the police as they were worried that she was intoxicated. Her driving was reported as "iffy," her speech was slow, and she seemed "out of it." A police officer that was personally aware of the defendant responded and found her vehicle. He went to make a stop for a broken taillight, but defendant pulled into her driveway. When officer approached, defendant handed him unrelated paperwork and was slow to produce her diver license. Officer noted defendant's speech was slurred and she had a "thick tongue." She stumbled when she exited the vehicle and appeared disoriented. While he did not smell the odor of alcohol, he did suspect she was impaired. Officer did the HGN test which showed 4 of 6 clues. Due to a back injury, the other two tests were not completed. 

Officer arrested defendant and a blood draw resulted in various controlled substances being present in defendant's blood. 

Issue: Defendant challenged both the probable cause for the arrest and also claimed ineffective assistance of counsel due to no jury unanimity instruction. While a jury unanimity instruction was given for the DUI elements, there were two theories presented in that the defendant was impaired while driving to the bank and also after she arrived home and was still in actual physical control of the vehicle. There was no unanimity instruction for the alternate theories. 

Holding: There was clearly probable cause for the arrest and an officer knowing defendant personally did not outweigh the evidence available. While the jury was not instructed on unanimity for the theory of DUI, the court said it is highly unlikely that any juror would have believed the defendant's story and there was evidence of her impairment at the bank to corroborate the finding of guilt. 

This is a helpful case for both unanimity in DUI cases and also the probable cause analysis. You can find the full opinion here: State v Dutton

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