What does the 'I' clue refer to in the Walk and Turn test?

The 'I' clue in the Walk and Turn test refers specifically to "Inability to walk straight." This clue is critical in assessing a person's ability to maintain a straight line while performing the test, which includes taking a series of steps heel-to-toe along a designated line.

When a person exhibits an inability to walk straight, it indicates potential impairment, which is significant in determining whether the individual may be under the influence of alcohol or drugs. The Walk and Turn test is designed not only to evaluate balance but also to assess the individual's coordination and ability to follow instructions. Proper execution requires a straight path, and deviations from this path suggest a lack of control or balance.

Therefore, "Inability to walk straight" directly correlates with the indicators of physical impairment as evidenced during the test, making it an essential clue in the evaluation process.