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In the US, a zero tolerance law makes it illegal for a driver under 21 to drive with even a small amount of alcohol in their blood. That means 0.02 or lower, not the 0.08 adult limit. Every state has one. This guide covers what the limit means in practice and what happens to your license if you break it.
Key facts
- NHTSA: since June 1998, all states and DC have set a BAC limit of 0.02 or lower for drivers under 21. The exact limit varies by state.
- Congress started offering grants in 1988 to states that set a youth limit of 0.02 or less.
- The minimum legal drinking age is 21 in every state. NHTSA says all states comply with the National Minimum Drinking Age Act of 1984.
- Examples: California sets 0.01. New York makes 0.02 to 0.07 a zero tolerance violation. The Maryland MVA describes a restriction on under-21 drivers at a BAC between 0.02 and 0.08.
- Above the adult limit, an under-21 driver faces a full DUI or DWI charge as well as the youth penalties.
What does 0.02 BAC mean for a driver under 21?
In practice, it means do not drink at all before driving. New York’s manual warns that a 0.02 BAC could come from a single drink. California’s 0.01 limit is lower still. No amount of alcohol is “safe” under these laws, and states set the limit low precisely so there is nothing to calculate.
What happens if you break a zero tolerance law?
The main penalty is a license suspension or revocation, usually through the DMV, not a criminal court. State examples:
| State | Limit for under 21 | License penalty (first offense) |
|---|---|---|
| New York | 0.02 to 0.07 (Zero Tolerance Law) | 6-month suspension, $125 civil penalty, $100 fee to end the suspension. Second violation: revoked for 1 year or until 21, whichever is longer. |
| California | 0.01 or higher | A DUI conviction at 0.01 or higher: DMV may revoke your driving privilege for 1 year, and you must complete a licensed DUI program. |
| Florida | 0.02 or more | 6-month suspension (1 year if suspended under this rule before). At 0.05 or more, a substance abuse course is also needed before reinstatement. Refusing the test: 1 year (18 months for a second refusal). |
| Maryland | Alcohol restriction on under-21 licenses; the MVA cites 0.02 to 0.08 | The MVA must suspend or revoke a license when a restriction is broken. |
Other states set their own lengths. Check the alcohol chapter of your state handbook or your state guide.
Refusing the test
Implied consent applies to under-21 drivers too. In New York, refusing a test in a zero tolerance case means a revocation of at least 1 year. California also penalizes under-21 drivers who refuse or fail to complete a preliminary alcohol screening (PAS) test. See implied consent and DUI in the US.
Over the adult limit
Zero tolerance is the floor, not the ceiling. In New York, anyone under 21 convicted of an alcohol or drug driving offense faces a revocation of at least 1 year, and a second one means revocation until 21 or for 1 year, whichever is longer. In California, a PAS result of 0.05 or higher can lead to a breath or blood test and a DUI arrest.
Carrying alcohol in the car when you are under 21
Some states penalize under-21 drivers even when nobody has been drinking. California, for example:
- You may not carry alcohol in the vehicle unless a person 21 or older is with you. The container must be full, sealed and unopened.
- Police can impound the vehicle for up to 30 days.
- The court can fine you and suspend your license for 1 year. If you have no license yet, it can ask DMV to delay your first license for up to 1 year.
Some states can also suspend a young person’s license for alcohol offenses that have nothing to do with driving, such as underage possession or a fake ID. Check your state’s rules.
How it affects your permit or provisional license
Alcohol offenses can also cost you GDL progress. A suspension usually pauses or resets your permit holding period, and some states add extra conditions before you can move up to the next stage. Some states also require an alcohol and drug course before a first license, for example Georgia’s ADAP.
Common questions
Is the limit 0.00 or 0.02?
It depends on the state. NHTSA’s rule of thumb is “0.02 or lower”. California uses 0.01. Treat it as zero.
Does zero tolerance apply when I turn 21?
No. From 21 the adult limit applies: 0.08 in every state except Utah, which uses 0.05.
Can mouthwash or medicine put me over 0.02?
Some products contain alcohol, and some medicines impair driving on their own. California’s handbook says the law treats prescription and over-the-counter drugs that affect your driving the same as illegal drugs. Read the label. See drugged driving and cannabis.
Is a zero tolerance violation a criminal record?
In New York it is handled as a civil DMV matter with a civil penalty. A BAC at or above the adult limit is a criminal DWI or DUI. Other states handle it differently.
Will a suspension in another state count at home?
Usually yes. New York applies its under-21 penalties to offenses committed out of state. See points systems and license suspensions.
Does it affect car insurance?
A suspension or alcohol offense on your record usually raises premiums. See car insurance for new drivers.
Sources
- National Highway Traffic Safety Administration, “Countermeasures That Work: Zero-Tolerance Law Enforcement” (nhtsa.gov)
- National Highway Traffic Safety Administration, “Minimum Drinking Age Laws” fact sheet (nhtsa.gov)
- Interagency Coordinating Committee on the Prevention of Underage Drinking, “Youth Blood Alcohol Concentration Limits” (stopalcoholabuse.gov)
- New York DMV, “Penalties for Alcohol or Drug-Related Violations” and “Driver’s Manual, Chapter 9: Alcohol and Other Drugs” (dmv.ny.gov)
- California DMV, “California Driver’s Handbook, Section 9: Alcohol and Drugs” (dmv.ca.gov)
- Maryland MVA, “Reasons for Driving Restrictions” (mva.maryland.gov)
- Florida Statutes, “Section 322.2616” (leg.state.fl.us)