Checking IDs in California: Common Mistakes and How the FLAG Method Prevents Them

Updated November 8, 2026. Requirements and sources were reviewed as of this update. This article is general information, not legal advice.

Why ID checks deserve a second look

Checking identification is one of the most routine tasks in hospitality, and that is exactly why it goes wrong. On a slow afternoon, most servers check carefully. On a packed Saturday night, with a line at the bar and tickets stacking up, it is easy to glance at a card, see a photo and a birth year, and move on.

California treats sales to people under 21 seriously, and the consequences fall on both the person who served and the business that holds the license. The good news is that a careful, consistent routine prevents most mistakes. This guide explains what the law requires, what ABC recommends, and the specific errors that come up again and again.

What the law says

Business and Professions Code section 25658 prohibits selling, furnishing, or giving alcoholic beverages to anyone under 21. Two related provisions shape how ID checks work in practice.

Section 25660 defines “bona fide evidence of majority and identity.” According to the statute text published on ABC’s industry advisory on section 25660, acceptable documents are those issued by a federal, state, county, or municipal government, or a subdivision or agency of one, including a driver’s license, a military ID that contains the person’s name, date of birth, description, and picture, or a valid passport issued by the United States or a foreign government. ABC’s advisory adds that, for the government-document category, the issuing government or agency must be located within the United States, and that “Armed Forces” means the U.S. military.

The statute also creates a defense. Proof that the licensee or employee demanded, was shown, and acted in reliance on bona fide evidence is a defense to criminal prosecution or license discipline for a sale to a minor. But ABC’s advisory stresses two points. First, it is an affirmative defense, so the licensee has the burden of proving it. Second, it has two parts: the document must meet the statute’s requirements, and the person accepting it must make a reasonable inspection and act with due diligence to confirm the ID belongs to the person presenting it.

Section 25659 allows a licensee or employee to seize an ID that shows the person is under 21 or that is false. ABC’s checking identification guide explains the steps: issue a receipt to the person, attach a copy to the ID, keep a copy for your records with notes on what happened, and turn the ID over to local police or the sheriff within 24 hours.

What is at stake

For the license, ABC’s disciplinary guidelines list a 15-day suspension as the standard penalty for a first sale to a person under 21, a 25-day suspension for a second violation within 36 months, and revocation for a third violation within 36 months. The guidelines also say penalties may be adjusted up or down based on aggravating or mitigating factors in each case. Aggravating factors listed include prior disciplinary history and the appearance and actual age of the minor.

For the individual server, a sale to a minor can also bring a criminal citation. A training bulletin published by the Sacramento Police Department lists the criminal penalty for a seller’s first offense as a $250 fine and/or 24 to 32 hours of community service, with higher penalties for a second offense, in addition to possible discipline from an employer and against the license.

These consequences are real, but they are also predictable. The rest of this article focuses on how to avoid them.

Understanding decoy operations

Many servers first learn about ID enforcement through a decoy operation. ABC’s Minor Decoy Program page and its enforcement FAQs describe the rules under ABC Rule 141. A decoy must be under 20 years old and must appear to be under 21. The decoy must carry their own ID showing their correct date of birth, or carry no ID at all, and must show it on request. The decoy must answer truthfully any questions about their age, and after a sale, the decoy must identify the seller face to face. Law enforcement agencies must also notify licensees of the results afterward, whether or not a violation occurred.

Those rules carry an important lesson. A decoy is not using a fake ID. In most decoy sales, the problem is not a sophisticated forgery but a server who did not ask, did not read the card carefully, or did not do the math. ABC’s guide says this directly: in many decoy programs, the server is cited because they asked for ID but failed to calculate the person’s age.

The FLAG method

ABC recommends checking identification in a methodical, systematic way, and it offers a simple acronym: FLAG. ABC also advises asking customers to remove the ID from a wallet or holder so you can handle the card itself.

F is for Feel

Feel the card’s rigidity and thickness. Check that the edges are smooth and rounded, since lifted corners may be a sign of tampering. Run a finger over the front and back for bumps, ridges, or areas that seem cut and pasted, especially near the photo and date of birth. ABC notes that some IDs include security features such as a laser-engraved tactile signature or date of birth with raised characters.

L is for Look

Take your time. Look for alterations and for typefaces or spelling that seem off. Check that the photo matches the person, focusing on features that do not change easily, such as the shape of the nose, chin, ears, and eyes. Confirm that height and weight reasonably match. ABC points out several features of California cards: a minor’s driver license or ID card is vertical, while an adult’s is horizontal, and a minor’s card includes a red strip stating when the person turns 21. ABC also notes that holding a flashlight against the back of the card can reveal a laser perforation shaped like the California brown bear and the state outline.

A is for Ask

If something seems wrong, ask questions. ABC suggests asking the person to state their license or ID number, to confirm information printed on the card, or to say the month they were born. ABC notes that a person who answers with a number instead of the month’s name is a common warning sign. You can also ask for a signature and compare it to the card.

G is for Give back

If the ID passes these checks, give it back and complete the sale. If it does not, refuse the sale, and then either return the ID or seize it according to your company’s policy and the receipt and 24-hour rules in section 25659.

The most common mistakes

Drawing on ABC’s guidance, these are the errors that most often lead to trouble:

• Not asking at all. ABC’s FAQ notes that a licensee may demand ID whenever there is the slightest doubt about a patron’s age. Many venues simply ask everyone who appears under a set age, which removes guesswork.
• Looking without calculating. Reading the birth date is not the same as confirming the person is 21. Do the math every time, or use a posted “born on or before” date updated daily.
• Ignoring the vertical card. A vertical California card belongs to someone who was under 21 when it was issued. It may still be valid if the person has since turned 21, so check the date carefully.
• Accepting an ID through a wallet window. Plastic sleeves hide edges and texture. Ask for the card itself.
• Checking the first round only. Groups sometimes pass drinks to friends who were never checked. Watch who is actually drinking.
• Feeling rushed. A careful check takes seconds. Managers can set the tone by making clear that no one will be criticized for slowing down to check an ID.
• Accepting documents that do not qualify. Employee badges, membership cards, and similar cards that are not issued by a government agency do not meet section 25660, and even a government document must include the details needed to confirm age and identity.

Building a reliable house routine

Individual skill matters, but systems prevent mistakes on the busiest nights:

• Set a clear carding policy. Decide the age threshold at which staff must ask for ID, write it down, and apply it to everyone.
• Post the daily date. A sign behind the bar showing the birth date someone must have been born on or before to be 21 today speeds up the math.
• Back up refusals. Staff should know a manager will support them when they refuse service.
• Keep seizure supplies ready. If your policy allows seizure, keep a receipt book and a log on hand so the steps in section 25659 can be followed correctly.
• Review after decoy notices. When law enforcement notifies you of decoy results, use them as a coaching opportunity for the whole team, whether you passed or not.
• Train consistently. RBS training includes intervention techniques to prevent service to underage persons, and section 25680 lists that topic as part of required course content.

Frequently asked questions

Can I refuse service if I am unsure about an ID? Yes. ABC’s guide states that you have a right to refuse service to minors, and its FAQ says a licensee may demand ID whenever there is the slightest doubt about age.

Is a foreign passport acceptable? Section 25660 lists a valid passport issued by the United States or by a foreign government as bona fide evidence. As with any ID, you still need to inspect it reasonably and confirm it belongs to the person presenting it.

Does a good-faith check protect me from a convincing fake? It can. Section 25660 provides a defense when bona fide evidence was demanded, shown, and reasonably relied upon, but the licensee must prove both that the document qualified and that the inspection was reasonable.

Can I keep a fake ID? No. Under section 25659, a seized ID must be turned over to local law enforcement within 24 hours, with a receipt given to the person.

Tasting-room staff face similar ID questions; see, RBS Certification in California Tasting Rooms: What Winery, Brewery, and Distillery Staff Need to Know, for that setting.

The bottom line

Most ID mistakes are not about elaborate fakes. They happen when someone skips the check, skims the card, or forgets to do the math. A consistent FLAG routine, a clear house policy, and a team culture that rewards careful checks protect guests, protect servers, and protect the license.

Sources

1. California ABC, Business and Professions Code Section 25660 industry advisory
2. California ABC, Checking Identification
3. California ABC, Minor Decoy Program
4. California ABC, Enforcement Frequently Asked Questions
5. California ABC, Disciplinary Guidelines
6. Sacramento Police Department, ABC Training Bulletin (PDF)
7. California Legislature, Business and Professions Code §§25680–25686 (RBS Training Program Act)

This article is general information, not legal advice.