Must Utah officers perform mouth checks before breath alcohol tests? State v. Montgomery Explained

The Utah Court of Appeals has clarified a critical foundational requirement for breath alcohol test admissibility in DUI cases. In State v. Montgomery, the court held that officers must perform an initial mouth check before the required observation period to ensure the reliability of breath alcohol test results.

Background and Facts
Officer stopped Montgomery after observing him drive around a police barricade. After detecting signs of impairment including alcohol odor, bloodshot eyes, and slurred speech, Officer arrested Montgomery and transported him to the station for breath testing. Following an observation period of over 30 minutes, Officer administered the test without first checking Montgomery’s mouth for foreign matter. The test showed a breath alcohol level of 0.21, well above the legal threshold.

Key Legal Issues
Montgomery filed a Baker motion seeking to exclude the breath test results, arguing the test was unreliable because Officer failed to perform an initial mouth check and did not properly observe him during the observation period. The district court denied the motion, concluding that high-quality video surveillance of the entire observation period provided sufficient reliability despite the absence of a mouth check.

Court’s Analysis and Holding
The Court of Appeals reversed, holding that a mouth check is a foundational requirement for breath alcohol test admissibility. Under Utah’s three-prong Baker test, the State must establish proper machine function, qualified operator administration, and continuous observation ensuring nothing entered the defendant’s mouth during the 15-minute period. The court emphasized that all three observation criteria are undermined if officers fail to establish the suspect’s mouth was initially empty.

Practice Implications
This decision strengthens DUI defense strategies by establishing mouth checks as mandatory rather than discretionary. Defense attorneys should carefully examine whether officers performed initial mouth checks before breath testing. The ruling also clarifies that video surveillance cannot substitute for the foundational reliability ensured by physical mouth examination, providing a clear basis for Baker motions when this requirement is not met.