One-Leg Stand Test -
Standardized Field Sobriety Test

This test also has a 65 percent reliability that a driver is impaired (BAC of .10 or higher) if s/he cannot perform this action. Combined with the walk-and-turn test, reliability is about 80 percent. The driver is asked to stand with one foot raised about six inches. While doing so, s/he must count aloud (one thousand one, one thousand two, etc.) until asked to stop (about 30 seconds).