How accurate is the One-Leg Stand (OLS) test when conducted by itself?

The One-Leg Stand (OLS) test, when administered as a standalone assessment, demonstrates an accuracy of approximately 65%. This means that when the OLS test is conducted, it can correctly identify impaired individuals about two-thirds of the time. The OLS test involves asking the subject to stand on one leg for a period of time, typically around 30 seconds, while maintaining balance. Factors such as swaying, using arms for balance, and putting the foot down are indicators of impairment.

The accuracy rate reflects the test's effectiveness on its own, emphasizing that while it can be a useful indicator of sobriety, it is not infallible. In practical applications, law enforcement officers often use the OLS in conjunction with other assessments to strengthen the reliability of the overall evaluation of an individual's level of intoxication. Understanding this statistic helps in recognizing the limitations of the OLS test when used alone, and highlights the importance of a comprehensive approach in sobriety testing.