Which test allows a subject to maintain balance for 30 seconds while counting?

The One Leg Stand test requires a subject to maintain their balance on one leg while counting out loud, typically for a duration of 30 seconds. This test is specifically designed to assess a person's balance and ability to follow instructions, which are both important indicators of sobriety. During this task, the individual must concentrate on balancing as well as counting, which can be particularly challenging for someone under the influence of alcohol or other impairing substances.

This testing method is a part of the Standardized Field Sobriety Tests (SFST) protocol, which is grounded in research and aims to reliably evaluate the impairment level of a suspected DUI subject. Successful performance on this test signifies that the individual likely has their mental and physical faculties intact, while failure can indicate potential impairment.

Other tests, such as the Walk and Turn, assess different skills like coordination and multitasking rather than solely balance, and the Horizontal Gaze Nystagmus focuses on tracking eye movement in relation to alcohol impairment, making them different in purpose and execution compared to the One Leg Stand. The term "Field Sobriety" encompasses a broad range of tests, including the One Leg Stand, but does not specifically describe the balance aspect emphasized in the question.