Which of the following is NOT a clue observed during the One-Leg Stand test?

The One-Leg Stand test is designed to assess a person's balance and coordination as an indicator of sobriety. During this test, the officer looks for specific behaviors that signal impairment. The clues that are monitored include swaying, using arms for balance, and hopping. These actions suggest that the individual is struggling to maintain their balance on one leg, which is critical evidence of potential intoxication.

Walking in a straight line, however, is not a behavior associated with the One-Leg Stand test. Instead, it is part of the Horizontal Gaze Nystagmus test or the Walk-and-Turn test, which measure an individual's ability to follow directions and maintain a straight path. Therefore, this option is not relevant to the One-Leg Stand test, making it the correct choice as the action that is NOT a clue observed during this specific assessment.