Identifying Signs of Intoxication
Business & Professions Code §25602 prohibits sale or service to any 'obviously intoxicated person' — and 'obviously' is a behavioral standard, not a BAC test. You will not have a breathalyzer at the bar. You will have your eyes, ears, and trained pattern recognition. The ABC's RBS curriculum under Title 4 CCR §165 organizes the warning signs into four observation domains: speech, behavior, appearance, and judgment.
The four observation domains: speech, behavior, appearance, judgment
The ABC RBS curriculum trains servers to scan four domains continuously during a shift. Speech: slurring, mumbling, talking too loudly or too quietly, repeating themselves, slow or rambling sentences, loss of conversational thread, suddenly talkative if previously quiet, or sudden quiet if previously talkative. Behavior: aggression, loud profanity, picking fights, overly friendly or sexual with strangers, crying, mood swings, falling asleep at the bar, knocking things over. Appearance: bloodshot or glassy eyes, droopy eyelids, flushed face, unsteady on feet, swaying while seated, spilling drinks, fumbling with money or cards, difficulty lighting a cigarette or using a phone. Judgment: ordering doubles after several already, ordering for someone who is already obviously intoxicated, lighting cigarettes in non-smoking areas, arguing with staff over the bill, walking out without paying, getting into the wrong car. No single sign proves intoxication, and customers with disabilities, medications, or medical conditions can show some of these signs without alcohol. The key is the pattern — multiple signs across multiple domains, often accelerating over time on the same customer.
Tracking and pacing — the only reliable defense
Counting drinks is the single most effective server skill, because impairment lags behind intake. A customer who drinks four shots in twenty minutes may still look fine when the fourth shot is poured — but in another fifteen minutes you have a §25602 problem on the floor. Use a written tab, a POS chit, or a mental count for every customer; communicate with co-bartenders and servers when shifts change so the next person knows who has had what. Pacing: most adults can metabolize roughly one standard drink per hour. A customer drinking faster than that is building BAC, even if they look fine right now. Offer water with every drink, food when they have not eaten, and slow down service when the count is climbing. Use the 'count, communicate, control' framework: count drinks, communicate the count to coworkers and to the customer ('Let me get you some water with this one'), and control the pace by spacing rounds, switching to lower-ABV options, and offering food. A patron who orders three drinks at once for themselves is a flag, not a sale. Two-fisting (one in each hand) is a flag. Buying for the obviously intoxicated friend at the next stool is a flag and a §25602 sale if you pour it.
Difficult cases: tolerance, disability, medication, language
Not every customer who slurs is drunk. A customer with a speech impediment, a stroke history, or Parkinson's may slur all the time. A customer with a prosthetic leg may walk unsteadily. A customer with a hearing impairment may speak loudly. A customer on prescription medication may show drowsiness. A customer who speaks limited English may struggle to communicate complex orders. None of these by itself is intoxication. The pattern test still applies: are the signs across multiple domains, are they getting worse during the visit, do they accelerate after each drink? When you cannot tell, talk to the customer — a brief conversation reveals coherence or its absence faster than any other test. Ask their order back, ask about the day, ask about how they got here. A customer whose responses make sense, whose drinking pace is slow, and who has stable behavior over the visit is not §25602 intoxicated. A customer whose coherence deteriorates after each round is. Tolerance complicates this: a heavy-drinking regular may not look drunk at a BAC well over 0.08, but their judgment and reactions are still impaired and you can still be cited for serving them — California ABC has explicitly held that high tolerance is not a defense.
Pre-existing intoxication and the customer who arrives drunk
A customer who walks in already obviously intoxicated is a §25602 problem the moment you pour the first drink — your liability does not require you to have served them the drinks that got them there. The ABC takes the position, and California courts have agreed, that you must observe the customer at the door, at the bar, and at the table; if they arrive drunk, the answer is no service plus a safe departure plan. Common scenarios: the bar-hopping customer who has had three drinks at the place down the street; the wedding-reception guest who pre-gamed at the hotel; the airport-bar customer connecting from a long flight where they drank on the plane; the customer who finished a flask in the parking lot. The legal framework does not change with the scenario. Refuse service politely (the techniques are in Chapter 4), offer water and food only if they are willing to stay seated and calm, arrange a rideshare or a taxi, and never put car keys back in the hand of an obviously intoxicated customer. If you serve and they then drive and crash, §25602 (criminal), §25602.1 (limited civil dram-shop), and §24200 (license discipline) can all attach.
Last updated: May 2026