What should an officer do before starting an HGN test?

Before starting an HGN test, an officer should assess the subject for general demeanor and signs of impairment. This step is critical as it provides valuable context regarding the subject’s physical and mental state prior to conducting the test. Observing the subject allows the officer to identify any apparent indicators of intoxication or impairment, which can help determine the appropriate steps moving forward. It aids in establishing whether the subject is suitable for the test and provides a baseline for comparison during the HGN evaluation itself.

This approach ensures that the officer is informed about the overall condition of the individual, which is essential for the integrity of the test results and may influence the officer's decisions throughout the encounter. It also reinforces the importance of conducting a comprehensive evaluation rather than relying solely on the results of the HGN test, ensuring a thorough assessment of the situation.