If your son or daughter just got arrested, take a breath. This feels like the end of the world right now, and it isn't. But California treats underage drinking and driving harder than most parents expect, and there's a deadline you need to know about today.
Zero tolerance means exactly that
California's rule for drivers under 21 isn't the adult 0.08% limit. It's far lower.
Under Vehicle Code 23136, a driver under 21 can't legally drive with a BAC of 0.01% or higher. That's a civil offense, not a crime, but it still triggers an automatic one-year license suspension. A single sip of a drink can put someone over that line.
The three levels of underage DUI
One traffic stop can involve more than one violation. Here's the ladder, from lowest to highest.
| BAC | Statute | What it is | Main penalty |
|---|---|---|---|
| 0.01% or higher | VC 23136 | Civil offense (zero tolerance) | 1-year license suspension |
| 0.05% to 0.07% | VC 23140 | Infraction | Fine, 1-year suspension, alcohol program |
| 0.08% or higher, or impaired | VC 23152 | Misdemeanor DUI | Full adult DUI penalties |
At 0.08% and above, an underage driver is charged like an adult. That means possible jail, DUI school, probation, and a criminal record. The stakes jump at that level.
The 10-day deadline nobody tells you about
This is the part that catches families off guard. The license issue is separate from the court case, and it moves faster.
After the arrest, the DMV starts its own process. You have only 10 days to request a hearing to challenge the suspension. Miss that window and the suspension takes effect automatically, no matter what happens later in court. Calling early is the single most important thing you can do.
Refusing the test
Under-21 drivers agree to roadside testing just by driving in California. That's implied consent.
Refusing a chemical test brings its own suspension, one year for a first refusal, longer for repeats. A refusal can hurt even if the underlying case is weak.
Facing this in Chula Vista or the South Bay?
South Bay DUI cases run through the Chula Vista courthouse and the San Diego DMV Driver Safety office. A young person's first mistake doesn't have to define their record or their future. The right move now is a phone call, not a guess.