Which of the following is a clue that indicates a suspect cannot maintain balance while listening to instructions during the Walk-and-Turn test?

The clue that indicates a suspect cannot maintain balance while listening to instructions during the Walk-and-Turn test is the observation of the suspect being unable to keep their balance. This is crucial because the test is designed to evaluate not only walking ability but also the capacity to maintain balance during a complex task that requires dual attention: listening to instructions and performing physical actions simultaneously.

When a suspect displays an inability to keep balance, it suggests a possible impairment related to coordination, concentration, or both, which are affected by alcohol or drug consumption. This particular clue is indicative of a fundamental aspect of the test, as maintaining balance is essential for correctly executing the task involved in the Walk-and-Turn test.

Other clues, while still relevant, do not specifically indicate balance issues during the instruction phase. For example, starting before instructions are finished or stumbling while walking shows a lack of attention or coordination but does not directly address balance during the listening phase. Similarly, using arms for balance may suggest some difficulty but is not as clear an indication of overall balance impairment as the inability to keep balance itself.