Alcohol and the Law
What the law expects of you
Every state builds its alcohol rules on a few shared ideas: a minimum legal drinking age, a licensing system that makes the establishment responsible for what happens inside it, and liability for serving people who should not be served. A candidate must know the core concepts: the legal drinking age of 21, the meaning of a license, the difference between a sale and a service (including giving away or providing alcohol to a guest), and the categories of people who may not be served - minors, visibly intoxicated persons, and anyone unable to show valid identification when required.
Identification and its traps
Acceptable ID is generally a government-issued photo document: driver's license, state ID card, passport, or military ID. Traps to expect: an expired license is not valid ID; a college ID is not government-issued; a vertical or "under 21" format signals a young holder; and a birthdate that makes someone 21 today but not yesterday. You are not required to accept any ID you believe is altered or borrowed. When in doubt, refuse the sale - the law protects the server who declines.
Liability concepts
Know dram shop liability (civil liability for serving a visibly intoxicated person or minor who then causes harm) and criminal liability for serving minors or obviously intoxicated guests. Also know that the server and the establishment can both be held responsible. Do not confuse "I checked ID" with a legal defense if the ID was obviously fake.
Rule of thumb
If you cannot verify age, do not serve. No sale is safer legally than a doubtful sale.
Worked example
A guest hands you a license that expired two months ago. The photo matches and the birthdate shows age 24. Correct answer: refuse - an expired document is not valid ID, even if the person looks old enough.