How many clues are required for the Walk-and-Turn test to suggest a potential BAC above 0.10?

To determine whether a potential Blood Alcohol Concentration (BAC) of above 0.10 exists during the Walk-and-Turn test, at least two specific clues should be observed. The Walk-and-Turn test is designed to assess a person's ability to perform divided attention tasks, which are often impaired by alcohol consumption.

The test consists of a series of instructions and tasks, such as taking a series of steps in a straight line, turning, and returning back. Each indication of failure—such as starting too soon, not keeping the heel-to-toe alignment, or losing balance—counts as a clue. When an individual demonstrates two or more of these clues, it is an indicator that they might be impaired, supporting the conclusion that their BAC may be above the legal limit.

Understood in this way, having two clues provides enough behavioral evidence to suggest significant impairment, which is why maintaining an awareness of these criteria during the test is crucial for accurately assessing sobriety.