California’s approach to drinking and driving for anyone under 21 is dramatically stricter than the standard adult DUI framework. Three separate Vehicle Code sections can apply depending on your BAC, and each carries its own set of consequences. Understanding which law applies to your situation, how the process works, and what is at stake is essential for any young driver or parent navigating this.
Three Laws, Not One
Most people think of DUI as a single charge. For drivers under 21 in California, there are three distinct legal frameworks that can apply, sometimes simultaneously.
Vehicle Code § 23136: The Zero Tolerance Law
This is the foundational underage drinking and driving law in California. It makes it unlawful for any driver under 21 to operate a vehicle with a BAC of 0.01 percent or higher. That threshold is so low it is essentially any detectable amount of alcohol. A single standard drink, mouthwash containing alcohol, or even certain medications can produce a reading at this level.
Critically, a violation of VC § 23136 is not a crime. It is a civil offense. It carries no jail time, no criminal record, and no fine. The only penalty is an administrative one-year license suspension imposed by the DMV, handled entirely outside of criminal court. If you do not yet have a license, the suspension takes the form of a one-year delay before you can obtain one.
The officer uses a Preliminary Alcohol Screening device, the handheld roadside breathalyzer, to measure BAC for zero tolerance purposes. Unlike adult drivers who can generally decline the PAS test before arrest, drivers under 21 are deemed to have consented to the PAS test as a condition of their license. Refusing it triggers a separate one-year suspension regardless of whether any alcohol was actually present.
Vehicle Code § 23140: Underage DUI with BAC of 0.05 Percent or Higher
If your BAC is at or above 0.05 percent but below 0.08 percent, VC § 23140 applies in addition to the zero tolerance violation. This is an infraction, meaning it is a criminal matter processed through the court system but not a misdemeanor. It carries no jail time but the consequences are more serious than a pure zero tolerance violation.
Penalties for a first VC § 23140 offense include a one-year license suspension, a fine of up to $100, and mandatory enrollment in a three-month DUI education program if you are 18 or older. Drivers under 18 are generally processed through juvenile court, where the focus is on rehabilitation and records are typically sealed.
Vehicle Code § 23152: Standard Adult DUI
If your BAC reaches 0.08 percent or higher, or if the officer believes your driving was actually impaired regardless of your specific BAC, you can be charged with standard adult DUI under VC § 23152. This is a misdemeanor with the same criminal consequences adults face: up to six months in county jail for a first offense, fines between $390 and $1,000 plus penalty assessments that push the real cost significantly higher, three to five years of informal probation, and a mandatory DUI education program. The license suspension is also longer than under the lower-BAC statutes.
An underage driver can face charges under VC § 23152(a) based on observed impairment even with a BAC below 0.08 percent. If the officer observes slurred speech, difficulty with balance, erratic driving, or other signs of impairment, the officer can charge impairment-based DUI at any BAC level. This means a driver under 21 with a BAC of 0.06 percent could simultaneously face a zero tolerance violation, a VC § 23140 infraction, and a VC § 23152(a) misdemeanor charge.
The BAC Threshold Map
To put it plainly in one place:
- 0.01% or higher: VC § 23136 zero tolerance civil violation, one-year DMV suspension, no criminal charge
- 0.05% to 0.07%: VC § 23140 infraction added, fine and DUI education program
- 0.08% or higher, or observed impairment at any level: VC § 23152 misdemeanor DUI, same as adult penalties
The DMV Process
As with any DUI arrest, the DMV and the criminal court are two separate proceedings. The zero tolerance suspension under VC § 23136 is an administrative action handled entirely through the DMV. The 10-day window to request a DMV hearing applies here exactly as it does in adult DUI cases. If you do not request a hearing within 10 days of the citation, the one-year suspension becomes automatic.
The DMV hearing for a zero tolerance case focuses on whether the officer had reasonable cause to believe you were driving with a BAC of 0.01 percent or higher, whether the stop was lawful, and whether the test result was valid. These are the same basic elements as an adult APS hearing, applied to the lower threshold.
Even if you are not charged criminally, the DMV action proceeds on its own. And if you are charged criminally under VC § 23140 or VC § 23152, a separate APS suspension may also be imposed by the DMV based on that arrest. Managing both proceedings simultaneously requires prompt action.
Which Court Handles It
Where your case is processed depends on your age and the severity of the charge.
Zero tolerance violations under VC § 23136 are handled entirely through the DMV, not any court.
Infractions under VC § 23140 for drivers under 18 are typically processed through juvenile court. The juvenile system emphasizes rehabilitation over punishment, and records from juvenile proceedings are generally sealed when the minor turns 18, provided certain conditions are met. For drivers who are 18, 19, or 20, VC § 23140 infractions are handled in adult court and create a record that is not automatically sealed.
Misdemeanor charges under VC § 23152 are handled in adult criminal court regardless of whether the driver is 18, 19, or 20. Drivers under 18 charged with a misdemeanor DUI may still be processed through the juvenile system in some circumstances, but the more serious the offense, the more likely adult court treatment becomes.
Collateral Consequences for Young Drivers
The consequences of an underage DUI extend well beyond the immediate legal penalties, and for young people at the beginning of their adult lives, those collateral consequences can be the most damaging part.
College admissions and financial aid. Many colleges ask about criminal history on their applications, and a misdemeanor DUI can affect admissions decisions or scholarship eligibility. Federal student aid is generally not affected by a DUI conviction involving alcohol alone, but individual institutional scholarships may have their own conduct requirements.
Employment. A misdemeanor DUI conviction creates a record that appears on background checks and can affect hiring decisions, particularly for jobs involving driving, working with children, or requiring professional licenses. California’s ban-the-box laws limit when employers can ask about criminal history, but they do not eliminate the impact of a conviction once disclosed.
Professional licensing. Many professional licensing boards, including those for nursing, teaching, law, real estate, and contracting, require disclosure of criminal convictions and have the authority to deny or condition licenses based on them. A DUI conviction at 19 can complicate a licensing application years later.
Insurance. An underage DUI conviction results in the same insurance consequences as an adult DUI, including loss of the good driver discount for ten years and significant premium increases. The SR-22 requirement attaches if there is a license suspension that requires reinstatement.
Immigration. For non-citizen students or young adults, any alcohol-related conviction carries potential immigration consequences that require separate consultation with an immigration attorney.
The PAS Test Requirement for Underage Drivers
One of the most important practical differences between underage and adult DUI law in California is the mandatory PAS test requirement. Adult drivers over 21 generally have the right to decline the roadside breathalyzer before arrest without automatic penalty, though they must submit to a chemical test after arrest under the implied consent law.
Drivers under 21 are in a different position. California Vehicle Code § 23136(c) provides that any person under 21 who holds a driver’s license is deemed to have consented to a PAS test. Refusing the PAS test as an underage driver triggers a one-year suspension independent of any other charge. There is no option to decline it without consequence.
After arrest, the implied consent law applies to underage drivers the same way it applies to adults. Refusal of the post-arrest chemical test triggers its own separate suspension of one to three years depending on prior history, and the refusal can be used against you in court.
Defenses That Apply
The same defenses available in adult DUI cases apply to underage DUI cases and are worth pursuing with the same seriousness.
The legality of the stop is the starting point. If the officer did not have a lawful basis for the stop, the evidence obtained may be suppressible. Minor traffic violations, anonymous tips, or vague observations of driving that does not clearly violate any law are all worth examining.
The accuracy of the PAS device and any subsequent chemical test is also challengeable. PAS devices have calibration and maintenance requirements. An officer must observe you for a period before administering the test to ensure no mouth alcohol is present. These procedural requirements apply regardless of your age.
Rising blood alcohol, GERD, and other medical conditions that can affect breathalyzer readings apply equally to underage drivers. A young person who had one or two drinks hours before driving may have a test result that overstates their BAC at the time of driving if the test was administered much later.
For drivers under 18, juvenile diversion programs may be available as an alternative to adjudication. For drivers who are 18 to 20, standard adult diversion mechanisms including deferred entry of judgment and other pretrial dispositions are worth exploring depending on the county and the specific charge.
What to Do Immediately
The 10-day DMV hearing request deadline applies regardless of your age. Act on it immediately. Beyond that, read Just Got a DUI: What Do I Do? for the full picture on the immediate steps following any DUI arrest. The steps are the same for underage drivers as for adults: request the DMV hearing, retain an attorney, and begin building your mitigation record before your first court appearance.
For drivers under 18, a parent or guardian should be involved from the beginning and should be present at any meetings with law enforcement or the court. Juvenile proceedings have their own procedural rules, and having experienced representation in juvenile court is as important as it is in adult court.
Citations
- California Vehicle Code § 23136 (zero tolerance law, BAC 0.01% or higher for drivers under 21).
- California Vehicle Code § 23140 (underage DUI, BAC 0.05% or higher).
- California Vehicle Code § 23152 (standard adult DUI offenses).
- California Vehicle Code § 23224 (possession of alcohol in vehicle by person under 21).
- California Vehicle Code § 13352.6 (license suspension for VC § 23140 violation).
- California Vehicle Code § 23612 (implied consent law, chemical testing after arrest).