What are the three standardized field sobriety tests commonly used by law enforcement?

The three standardized field sobriety tests commonly used by law enforcement are the Horizontal Gaze Nystagmus, Walk-and-Turn, and One-Leg Stand. These tests are validated for use in assessing a person's impairment due to alcohol and are part of a structured approach to roadside evaluations.

The Horizontal Gaze Nystagmus test evaluates how well a person can follow a moving object with their eyes, checking for any involuntary jerking that can indicate impairment. The Walk-and-Turn test assesses a person's ability to follow instructions and maintain balance while performing a task that requires coordination. The One-Leg Stand test further challenges balance and coordination by requiring the individual to stand on one leg for a period of time.

These tests are specifically designed to measure certain physical and cognitive functions that are often impaired by alcohol consumption, making their use in sobriety assessments widely accepted in law enforcement to ensure accuracy in determining a person's level of intoxication.