During the One-Leg Stand, which of the following actions signifies clues of impairment?

The action of hopping or putting the foot down during the One-Leg Stand test is a significant indicator of impairment. This part of the Standardized Field Sobriety Test is designed to assess a person's ability to balance and maintain their stability while performing a task that requires concentration and physical coordination.

When an individual is impaired, their overall physical control and coordination can be affected. Hopping demonstrates an inability to maintain balance and indicates difficulty with proprioception, which is the sense of body position and movement. Similarly, putting the foot down signifies that the person cannot maintain the necessary stability to complete the task, further supporting the likelihood of impairment.

In contrast, keeping both feet on the ground doesn't provide any insight into the individual's balance or impairment level in this context. Crossing the arms typically doesn't impact the legs' performance in the test, so it does not directly indicate impairment. Lifting the foot without swaying may show good balance, which would not suggest impairment either. Hence, the actions associated with hopping or lowering a foot highlight significant clues of impairment.