For a Northern Arizona University student, an underage DUI is one of those moments where a single night collides with a future — financial aid, housing, a scholarship, a professional program years away. Arizona is a zero-tolerance state: if you’re under 21, you don’t need to be drunk, or even close, to be charged. Any detectable alcohol behind the wheel is enough. This page lays out what the under-21 law actually says, how it stacks with a regular DUI, and why the campus and career fallout is often the part that hurts most.
Two clocks and a lot at stake. Like any DUI, an underage charge starts a separate MVD license case with a short (about 15-day) window to request a hearing. For an NAU student it can also trigger university and financial-aid consequences. Get ahead of both quickly — the first move is protecting the license and the record.
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Zero tolerance: Arizona’s “baby DUI” law
Under A.R.S. § 4-244, it’s unlawful for anyone under 21 to drive or be in actual physical control of a vehicle with any spirituous liquor in their body — often called the “baby DUI” or zero-tolerance law. There’s no 0.08 threshold and no “I only had one” allowance: a trace amount is enough to charge. It’s a Class 1 misdemeanor (the most serious misdemeanor class), and the MVD imposes a two-year license suspension on an offender who was 18, 19, or 20 at the time.
That two-year suspension is often the consequence that reshapes a college year the most — no lawful driving to class, to a job, or home to another town — which is exactly why the license side deserves attention from day one.
When it’s also a “regular” DUI
Zero-tolerance and standard DUI can be charged together. If an under-21 driver is actually impaired to the slightest degree, or blows 0.08 or higher, the ordinary DUI statute (A.R.S. § 28-1381) applies on top of the under-21 charge — with its mandatory jail, fines, and its own license and interlock consequences. And a 0.15-plus reading pulls in the Extreme DUI tier regardless of age. So an underage case can range from a zero-tolerance charge alone to a full DUI stack, depending on the numbers. The main DUI guide covers those adult tiers.
Minor in Possession (MIP) — the charge that often comes with it
Alcohol charges for people under 21 aren’t limited to driving. Under the same statute, a minor who possesses or consumes alcohol — even without driving — can be charged with Minor in Possession (MIP), also a Class 1 misdemeanor, carrying possible fines, probation, mandatory alcohol classes, and a license suspension. “Possession” can be read broadly, and MIP frequently rides along with an underage DUI or shows up on its own after a party or a stop near campus. It is a criminal charge, not a ticket, and it goes on a record.
The part that outlasts the case: collateral consequences for NAU students
For a student, the courtroom penalty is frequently not the worst part. A misdemeanor alcohol conviction can reach into:
- Financial aid and scholarships — some awards and programs ask about criminal history or have conduct conditions.
- Housing — on-campus and many off-campus leases have conduct clauses.
- University discipline — a criminal charge can run alongside a separate NAU student-conduct process.
- Professional futures — nursing, education, law, aviation, and other licensing paths ask about convictions, sometimes years later.
- Immigration — for international students, any criminal charge can carry visa and status consequences and should be handled with particular care.
These downstream effects are exactly what a first-time young defendant doesn’t see coming, and they’re a big reason it’s worth having someone weigh whether to fight the charge, seek a reduction, or pursue a diversion-style resolution that can keep a conviction off the record where eligibility allows.
If this is also your first alcohol offense generally, the first-offense DUI guide walks through the penalties and the defenses in more depth. If marijuana was involved instead of (or alongside) alcohol, see marijuana DUI in Arizona — and for possession charges specifically, our Flagstaff drug-crimes guide.
What to do right away
- Find the arrest/MVD paperwork and note the ~15-day hearing deadline — the license clock runs regardless of the campus timeline.
- Don’t discuss it beyond a lawyer — not roommates, not social media, and be careful with any university conduct interview before getting advice.
- Write down the night’s details while fresh: the stop, the testing, the timing.
- Don’t drive on a suspended license — it can escalate the situation badly.
- Get a free consultation to understand both the criminal exposure and the collateral (aid/housing/immigration) risks specific to your situation.
Frequently asked questions
I only had one drink and I wasn’t drunk — can I still be charged?
Yes. Arizona’s under-21 law is zero tolerance: any detectable alcohol in your body while driving is enough for a Class 1 misdemeanor charge, regardless of whether you were impaired or under 0.08.
How long will my license be suspended?
For a zero-tolerance violation at age 18, 19, or 20, the MVD imposes a two-year suspension. If a standard DUI is also charged, additional license and ignition-interlock consequences can apply on top.
Is MIP a big deal, or just a ticket?
It’s a criminal charge — a Class 1 misdemeanor — not a civil ticket, and it can carry fines, alcohol classes, probation, a license suspension, and a record. It’s worth treating seriously, especially with school and future licensing in mind.
Will NAU find out, and can they discipline me separately?
A criminal case and a university student-conduct process are separate tracks and can run at the same time. How much to say in a conduct interview is a question to raise with a lawyer first, because statements there can affect the criminal case.
I’m an international student — how worried should I be?
Take it seriously. Any criminal charge can carry immigration and visa consequences for non-citizens, and those are best handled with counsel who will factor status into the strategy from the start.
Can an underage charge be kept off my record?
Sometimes — depending on the facts and eligibility, options like a reduction or a diversion-style resolution may avoid a conviction. That’s exactly what an early consultation is for.
What happens if I refused the breath or blood test?
Arizona’s implied-consent law applies to under-21 drivers too: refusing a chemical test triggers its own automatic license suspension — a year for a first refusal — on top of the zero-tolerance consequences, and officers can still get a warrant for a blood draw. Refusing rarely helps a young driver and usually adds another layer of license trouble.
I turned 21 before my court date — does that change anything?
No. What matters is your age at the time of the stop, not at the hearing. If you were under 21 when it happened, the zero-tolerance law and its penalties still apply even if you’ve since had a birthday.
Under-21 DUI or MIP in Flagstaff? Get a free, confidential read
Tell us what happened and we’ll connect you with an independent licensed Arizona attorney who handles underage DUI and MIP cases for NAU students and other Coconino County residents. Free, confidential, no obligation.
Related guides
Sources & Corrections
Primary sources checked for this page on July 30, 2026:
- A.R.S. § 4-244 — Unlawful acts (under-21 driving with liquor in body; minor in possession/consumption)
- A.R.S. § 28-1381 — Driving under the influence (applies when an under-21 driver is also impaired or 0.08+)
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Not legal advice. The Flagstaff Legal Resource Center is an independent referral service operated by Wilder West Assets LLC — not a law firm. Penalties and collateral consequences depend on the facts of your case and your circumstances. No attorney-client relationship is created by using this site. Verify any attorney’s credentials through the State Bar of Arizona.