How many standard exercises are included in the Standardized Field Sobriety Test?

The Standardized Field Sobriety Test (SFST) consists of three standardized exercises: the Horizontal Gaze Nystagmus (HGN), the Walk-and-Turn, and the One-Leg Stand. Each of these exercises is designed to assess various aspects of a person's physical and cognitive abilities that may be impaired due to alcohol or drug use.

The Horizontal Gaze Nystagmus evaluates the subject's ability to track a moving object with their eyes, where signs of nystagmus (involuntary eye movement) can indicate impairment. The Walk-and-Turn tests balance, coordination, and the ability to follow instructions, as the subject must walk heel-to-toe in a straight line and then turn to return. The One-Leg Stand assesses balance and motor skills, requiring the individual to stand on one leg while counting, which can be challenging under the influence of substances.

Recognizing that the SFST is structured around these three exercises helps law enforcement officers effectively determine whether a driver may be impaired. This systematic approach is crucial in ensuring consistent and reliable assessments in various conditions.