Can an officer's personal knowledge of a defendant establish probable cause for DUI arrest? State v. Dutton Explained

In State v. Dutton, the Utah Court of Appeals addressed whether an officer’s personal knowledge of a defendant’s normal behavior can be considered in determining probable cause for a DUI arrest, ultimately holding that probable cause existed based on objective circumstances regardless of such subjective knowledge.

Background and Facts

Bank employees called 911 after observing Breanna Dutton struggling at a drive-up window, noting her “pretty iffy” driving and slurred speech that made them believe she was intoxicated. A responding sergeant, who had known Dutton for years and was familiar with her normal behavior, observed multiple signs of impairment including slurred speech, stumbling, confused responses, and four clues during horizontal gaze nystagmus testing. Blood testing later revealed methamphetamine in toxic ranges and other drugs in therapeutic ranges.

Key Legal Issues

Dutton moved to suppress evidence from her arrest, arguing the officer lacked probable cause and that his subjective knowledge of her normal behavior violated the objective probable cause standard. She also claimed ineffective assistance of counsel for failing to request a specific unanimity jury instruction when the State presented two theories of when she became intoxicated.

Court’s Analysis and Holding

The court applied the totality of the circumstances test, finding probable cause existed even without considering the officer’s personal knowledge of Dutton. The court emphasized three key factors: (1) a reliable citizen informant tip from bank employees who observed erratic behavior, (2) the officer’s direct observations of slurred speech, stumbling, and confusion, and (3) Dutton’s performance on field sobriety tests showing four clues indicative of impairment. Regarding ineffective assistance, the court found no prejudice because Dutton’s testimony that she only consumed drugs after being stopped lacked credibility given the earlier observations of impairment.

Practice Implications

This decision reinforces that probable cause determinations must consider objective factors supporting a reasonable belief of guilt. While the court acknowledged the “practical problem” of expecting small-town officers to disregard personal knowledge, it ultimately relied on objective circumstances. Practitioners should focus on challenging the reliability of citizen tips and the accuracy of field sobriety test administration rather than arguing officers must ignore relevant background knowledge.