Which technique can be used to assess a person's level of intoxication?

Observing the customer is an effective technique to assess a person's level of intoxication as it involves noticing behavioral and physical signs that indicate impairment. Signs such as slurred speech, difficulty maintaining balance, impaired coordination, and changes in social behavior are all indicators that can be observed without the need for invasive procedures or specialized equipment.

This method allows for an immediate assessment without the need for medical devices and gives staff the ability to gauge a person's state by noting their interactions and reactions in real-time. It emphasizes the importance of being alert and attentive to the patrons in a licensed environment.

Other options, while they may be related to health assessments, do not provide a direct and practical way to evaluate intoxication. Reading a pulse or measuring blood pressure may provide some information about a person's health but are not reliable indicators of intoxication levels. Conducting a breathalyzer test, while a scientifically valid method for measuring blood alcohol concentration, requires specific equipment and training, making it less accessible in everyday situations compared to simply observing the behavior of the customers.