What percentage of the time can the One Leg Stand test determine if a subject's BAC is above or below 0.08?

The One Leg Stand test is one of the standardized field sobriety tests (SFST) commonly used by law enforcement to assess a subject's level of impairment due to alcohol consumption. Research on the efficacy of this test has shown that it can reliably determine whether a subject's blood alcohol concentration (BAC) is above or below the legal limit of 0.08.

The correct answer of 83% indicates that the One Leg Stand test is able to correctly identify whether a subject's BAC is above or below this threshold a significant majority of the time. This percentage reflects the reliability of the test within its intended context, showcasing its effectiveness as an indicator of impairment when performed under standardized conditions.

This level of accuracy signifies that while there is a degree of margin for error, the One Leg Stand test remains a key component in the assessment of driver impairment, providing law enforcement with a tool that supports the identification of drivers who may pose a risk to public safety due to alcohol consumption.