What is the maximum duration for the One-Leg Stand test?

The One-Leg Stand test is designed to assess a person's balance and ability to follow instructions, which are often impacted by impairment. During this test, the subject is asked to stand on one leg while counting aloud for a duration of 30 seconds. This time frame has been established based on research indicating that 30 seconds is sufficient to observe signs of impairment, such as swaying, using arms for balance, or putting a foot down.

The duration is critical because it allows law enforcement officers to evaluate the individual's stability and coordination, which are key indicators of their physical capabilities under the influence of alcohol or drugs. A time frame shorter than this would not provide an adequate assessment, while a longer duration could unnecessarily burden the subject or lead to fatigue, potentially skewing results.