For how many seconds must a subject keep their foot elevated in the One Leg Stand test?

In the One Leg Stand test, the subject is required to elevate one foot approximately six inches off the ground and maintain that position for a duration of 30 seconds. This specific time frame allows for the evaluation of the subject's balance and coordination, which are critical indicators of impairment. Maintaining the foot in that position for 30 seconds provides enough observation time for the officer to assess any signs of instability or inability to follow instructions. This standardized time duration is a key part of the methodology in the Standardized Field Sobriety Tests (SFST) to ensure consistency and reliability in the evaluation of a subject's physical abilities under potential impairment conditions.