Recognizing Intoxication
The ability to recognize when a guest is becoming intoxicated is one of the most important skills in responsible alcohol service. Because a server cannot measure blood alcohol directly, they must rely on observable behavior and an understanding of how alcohol affects the body. This chapter covers Blood Alcohol Concentration and the factors that influence it, the rate at which the body absorbs and processes alcohol, and the behavioral signs that appear as intoxication progresses. It also dispels common myths, such as the belief that coffee or fresh air can sober someone up, so that service decisions rest on facts rather than assumptions.
Blood Alcohol Concentration and How the Body Processes Alcohol
Blood Alcohol Concentration, or BAC, is the percentage of alcohol in a person's bloodstream, and it rises when someone drinks faster than the body can process it. The liver metabolizes alcohol at a roughly steady rate of about one standard drink per hour, and nothing speeds this up. Understanding this steady rate helps a server see why pacing matters and why time is the only thing that truly lowers BAC.
Factors That Affect Absorption and BAC
Several personal factors determine how quickly a guest's BAC rises and how strongly they are affected. Food in the stomach, especially protein and fat, slows absorption, while an empty stomach speeds it. Body weight, biological sex, drinking pace, and even certain medications all influence the outcome, which is why the same number of drinks can affect two people very differently.
Behavioral Signs of Intoxication
Since servers cannot measure BAC, they watch for behavioral cues that reveal impairment. Early signs often include lowered inhibitions, such as becoming unusually loud, talkative, or overly friendly, because alcohol affects judgment and self-control first. As intoxication deepens, guests may slur speech, have glassy eyes, struggle with simple tasks, and lose coordination or balance.
Assessing Guests Individually
Because a drink count rarely tells the whole story, servers should assess each guest by watching how their behavior changes over the course of the visit. A guest may have been drinking before arriving, and tolerance can hide some outward signs even though BAC still rises and judgment is still impaired. Observing behavior over time is the most reliable practical tool a server has.
Common Myths and Responsible Responses
Many popular beliefs about sobering up are simply false, and acting on them can lead to over-service. Coffee, cold showers, and fresh air may make a guest feel more alert but do nothing to lower BAC or reduce impairment. When intoxication signs increase, the responsible response is to slow or stop alcohol service and steer the guest toward water, food, and safe transportation.
Last updated: July 2026