Which of the following is NOT one of the clues indicated in the performance phase of the walk and turn test?

In the context of the walk and turn test, which is commonly used to assess a person's level of impairment, the performance phase involves observing specific behaviors that can indicate difficulty in coordination or balance. The correct choice, which is "Fails to smile throughout the test," is not a relevant criterion for this assessment.

The walk and turn test primarily evaluates the physical and cognitive abilities that are crucial for maintaining balance and coordination while walking in a straight line. The performance clues considered important include starting the test prematurely, stopping while walking (which can suggest a lack of balance or confusion), and using arms for balance (indicating difficulty with coordination). Smiling, while it may be a natural response in a testing situation, does not affect an individual's physical capacity to perform the test. This makes it irrelevant to the performance assessment and thus not a clue indicating impairment.