What is one key observation during the Walk-and-Turn test?

One key observation during the Walk-and-Turn test is the balance while walking a straight line. This test is designed to assess an individual's ability to follow instructions, maintain balance, and walk in a straight line, which can indicate potential impairment. Observing the subject's ability to keep their balance while they walk heel-to-toe can reveal difficulties that may suggest intoxication. If they sway, step off the line, or have trouble with turns, these behaviors contribute to the overall assessment of sobriety. The emphasis on balance in this test is crucial since it directly relates to the motor skills and coordination that are often impaired by alcohol or drugs.