What should an officer do if they observe multiple clues of impairment during HGN testing?

When an officer observes multiple clues of impairment during Horizontal Gaze Nystagmus (HGN) testing, it is crucial for them to consider further testing or potentially arrest the individual for driving under the influence (DUI). HGN is a field sobriety test that reveals specific signs of alcohol or drug impairment through the measurement of eye movement when the subject is asked to follow a stimulus, usually a pen or finger.

The presence of multiple clues, such as distinct nystagmus at maximum deviation or the inability to smoothly pursue the object, indicates a significant impairment level that warrants additional action. This can include conducting further sobriety tests or initiating an arrest, as the objective is to ensure public safety and enforce DUI laws. Ensuring a thorough process helps build a stronger case and ensures that the individual is properly assessed for their level of impairment.

In this context, documentation alone or dismissing the results would not align with responsible law enforcement practices. Ignoring observed impairment can lead to dangerous situations on the road. Therefore, taking further steps after identifying multiple clues during HGN testing is the appropriate and responsible action for an officer to take.