Which of the following is a sign that a customer may be intoxicated?

The presence of slurred speech and unsteady movements is a clear indicator that a customer may be intoxicated. These signs are directly associated with the effects that alcohol has on the central nervous system, impairing motor skills and speech. Slurred speech often results from the relaxation of the muscles used to form words, while unsteady movements reflect a lack of coordination and balance that occurs as a person's blood alcohol concentration rises. Recognizing these signs is critical for staff in environments serving alcohol, as they help identify customers who may need intervention to ensure their safety and the safety of others.

In contrast, strong conversation ability, consistent eye contact, and regular behavior do not indicate intoxication. A person can maintain coherence in conversation and proper eye contact while still being under the influence of alcohol, especially if they are in the early stages of intoxication or attempting to mask their level of impairment. Regular behavior may even include actions that are typical and appropriate but may not always reflect the effects of alcohol consumption, as it can often take time for the signs of intoxication to manifest.