What is the purpose of the SFST in OUI investigations?

The purpose of the Standardized Field Sobriety Tests (SFST) in Operating Under the Influence (OUI) investigations is to assess impairment. These tests are specifically designed to evaluate a driver's physical and mental capabilities in relation to their ability to operate a motor vehicle safely. During an OUI investigation, law enforcement officers use SFSTs, which typically include tasks like the HGN (Horizontal Gaze Nystagmus) test, the Walk-and-Turn test, and the One-Leg Stand test, to determine if an individual is exhibiting signs of alcohol or drug impairment.

When an officer observes a driver performing these tasks, they look for specific clues that indicate impairment, such as difficulty in balancing, inability to follow instructions, or poor coordination. The results of these tests can significantly inform the officer's decision-making process regarding whether to arrest the individual for OUI, making the assessment of impairment a critical component of the investigation. This emphasis on determining the level of impairment is vital as it directly relates to the safety of the individual and the public, as well as the legal framework governing OUI offenses.