For how many seconds must a subject hold their foot raised during the OLS test?

In the One Leg Stand (OLS) test, the subject must hold their foot raised for a duration of 30 seconds. This time frame is crucial as it allows the officer to observe the subject's ability to maintain balance and stability on one leg. During this period, various indicators of impairment can be assessed, such as swaying, using arms for balance, or putting the raised foot down. The 30-second duration is standard in field sobriety tests to provide sufficient time to accurately evaluate the subject's physical coordination and cognitive function, which are often compromised under the influence of alcohol or drugs. The OLS test is structured in this way to gather reliable evidence as part of a comprehensive assessment process.