What is the approximate accuracy of the One Leg Stand at a .08 BAC?

What is the approximate accuracy of the One Leg Stand at a .08 BAC?

• A. 88%
• B. 83%
• C. 75%
• D. 90%

Answer: (B)

The One Leg Stand is a balance and coordination task used to flag impairment from alcohol. At a BAC around .08, it correctly signals impairment about 83% of the time. This means the test is fairly reliable at that level, but it isn’t perfect—some intoxicated people may pass, and some sober individuals can stumble due to fatigue, footwear, surface, or other factors. In practice, officers use it as part of a battery of tests to form a complete picture, rather than relying on it alone.

The One Leg Stand is a balance and coordination task used to flag impairment from alcohol. At a BAC around .08, it correctly signals impairment about 83% of the time. This means the test is fairly reliable at that level, but it isn’t perfect—some intoxicated people may pass, and some sober individuals can stumble due to fatigue, footwear, surface, or other factors. In practice, officers use it as part of a battery of tests to form a complete picture, rather than relying on it alone.