Which of the following is an indicator of impairment during personal contact?

Poor coordination is a well-recognized indicator of impairment during personal contact, particularly in the context of law enforcement interactions. When officers encounter individuals who are exhibiting difficulties with coordination, such as stumbling, difficulty in balancing, or problems with fine motor skills, it often suggests that the individual may be under the influence of drugs or alcohol. These observable signs can prompt further examination and assessment of the individual's sobriety.

While other choices might provide relevant information in different contexts, they do not serve the same direct function in identifying impairment. For instance, a lowered window may indicate a willingness to communicate but does not directly reflect the individual's cognitive or physical ability to operate a vehicle safely. Similarly, breath alcohol content is a measurement taken after impairment is suspected; it does not serve as an immediate indicator during personal contact. License plate status pertains to the legality of the vehicle's registration rather than the driver's condition. Therefore, observing poor coordination stands out as a clear and immediate sign of potential impairment.