Final answer:
Switching to stronger drinks may indicate that a person is becoming or already is intoxicated. Alcohol intoxication generally starts after more than two drinks, and it can be diagnosed through a combination of patient history, physical examination, witness confirmation, and measuring BAC.
Step-by-step explanation:
When a customer switches to stronger drinks, this may be a clue that he or she is becoming intoxicated or is intoxicated. Alcohol intoxication typically begins after consuming two or more alcoholic drinks. Diagnosis of intoxication is usually based on the history of events and physical examination, and may involve the verification of events by witnesses. It is often defined legally by a blood alcohol concentration (BAC) of greater than 5.4-17.4 mmol/L (25-80 mg/dL or 0.025-0.080%), which can be measured by blood or breath testing. The body breaks down alcohol at a rate of about 3.3 mmol/L (15 mg/dL) per hour, which is important to know when evaluating someone's level of intoxication.