Which field sobriety test requires the individual to balance on one leg?

The One Leg Stand test is designed to assess an individual's balance and coordination as part of field sobriety testing. During this test, the individual is instructed to stand on one leg while counting aloud for a specified duration, typically 30 seconds. This exercise challenges the subject's physical stability and attention, both of which can be impaired by alcohol consumption or drug use.

When conducting the One Leg Stand, law enforcement officers closely observe for signs of impairment, such as swaying, using arms for balance, or being unable to maintain the position. The ability to perform this task can indicate the motor skills and concentration levels that may be affected by substances, making it an effective measure for assessing sobriety.

In contrast, the other tests listed—Horizontal Gaze Nystagmus, Walk-and-Turn, and Breath Test Assessment—serve different purposes in evaluating a person's level of intoxication or impairment. Each of these tests has its own methodology and criteria, making them distinct from the One Leg Stand, which focuses prominently on balance and coordination.