Missouri DUI: The 15-Day and 30-Day Deadlines You Cannot Miss

The short answer

After a Missouri DUI arrest, your driver's license runs on its own clock, separate from the criminal case, and which clock applies depends on one fact: whether you took the breath or blood test. If you took the test and blew over the limit, you have 15 days from the date the Department of Revenue's Notice of Suspension/Revocation is issued to request an administrative hearing. If you refused the test, that is a different and longer process: a one-year license revocation under Missouri's implied consent law, and a 30-day window to file a Petition for Review in circuit court. Kansas runs its own separate 14-day deadline, and it is not interchangeable with either Missouri clock. Missing the deadline that actually applies to your case means the license action takes effect automatically, regardless of what happens later in court.

Why there are two different deadlines

Missouri treats a DUI arrest as two cases running side by side. One is the criminal case, handled in municipal or circuit court. The other is an administrative license case, handled by the Missouri Department of Revenue. The administrative case moves on its own schedule and does not wait for the criminal case to resolve. People often assume their license is safe until a judge rules on the DUI charge. It is not. The DOR can suspend or revoke a license entirely apart from anything happening in the courtroom, and the paperwork that starts that clock usually arrives within days of the arrest.

What confuses drivers, understandably, is that Missouri does not use one deadline for this. It uses two, and they apply to two different situations.

If you took the test and blew over the limit: 15 days

If you took a breath or blood test and the result came back at or above the legal limit, the arresting officer typically serves you with a Notice of Suspension/Revocation of Driving Privilege on the spot. According to the Missouri Department of Revenue, you have 15 days from the date that notice is issued to request an administrative hearing. The request has to be received or postmarked within that window. If you let the 15 days pass without requesting a hearing, the suspension or revocation takes effect and there is no administrative hearing left to request. This is the deadline most people have heard of, because it is the more common scenario. It is not, however, the only deadline Missouri uses.

If you refused the test: a different clock, 30 days

Refusing the breath or blood test does not avoid a license consequence. It triggers a separate process under Missouri's implied consent law, specifically RSMo 302.574. A refusal results in a one-year license revocation, which is longer than the suspension period tied to most first-offense test failures. To challenge a refusal revocation, you do not request a DOR administrative hearing. Instead, according to the Missouri Department of Revenue, you must file a Petition for Review in the circuit court for the county where the arrest occurred, within 30 days from the date the Notice of Revocation is issued. That petition asks the circuit court, not the DOR, to review whether the revocation was proper.

This is the distinction that matters most and the one that gets confused most often: a test failure gives you 15 days to request a hearing with the DOR, while a refusal gives you 30 days to file a petition with the circuit court. They are not the same deadline attached to two names. They are two different procedures, in two different forums, triggered by two different facts about what happened during the stop.

Kansas has its own 14-day window, and it does not carry over

If the stop happened on the Kansas side of the state line, none of the Missouri deadlines above apply. Kansas runs its own administrative process through the Kansas Department of Revenue, and a driver generally has 14 calendar days from the date of service of the officer's certification to request a hearing on a license suspension. That is a shorter window than either Missouri deadline, and it is a genuinely separate state process with its own forms, its own agency, and its own rules. A driver arrested in Kansas cannot rely on a Missouri deadline, and a driver arrested in Missouri gets no benefit from Kansas's process. Because the Kansas City metro sits on both sides of the state line, it is worth confirming which state's process applies to your arrest before assuming a deadline.

Why this trips people up

Most of the deadline confusion comes down to one thing: people hear "15 days" somewhere, whether from a friend's case, a search result, or a general summary, and assume it applies to their own situation without checking whether their case involved a test or a refusal. A refusal case that is treated like a test-failure case can miss the correct filing window entirely, even though the driver genuinely believed they were acting in time. The safest approach is to identify which notice you actually received. A Notice of Suspension/Revocation tied to a test result points to the 15-day DOR hearing request. A Notice of Revocation tied to a refusal points to the 30-day circuit court petition. The documents look similar. The deadlines and the forums they lead to are not the same.

What this means for your case

These are license deadlines, and they run independently of the criminal DUI or DWI charge. Whatever ultimately happens in the criminal case, a missed administrative deadline still results in the suspension or revocation going into effect. This is general information about how the two Missouri processes work and about the separate Kansas process. It is not legal advice, and it does not evaluate the facts of any specific arrest. If you are unsure which deadline applies to your situation, or how many days you have left, that is worth confirming quickly rather than guessing. For a broader look at what a Missouri or Kansas DUI ultimately costs once the license process, court fees, and insurance increases are added up, see How Much Does a DUI Cost in Kansas City?

Frequently asked questions

What happens if I miss the 15-day deadline? If the 15 days pass without a hearing request being received or postmarked, the suspension or revocation from the test result takes effect. There is no administrative hearing left to request once the window closes.

Does refusing the test avoid a suspension? No. A refusal triggers its own one-year license revocation under Missouri's implied consent law, which is longer than most first-offense test-failure suspensions. Refusing changes the process, not whether the license is affected.

Do I request the 30-day refusal appeal with the DOR or in court? In court. A test-failure case goes through a DOR administrative hearing request. A refusal case is different: you file a Petition for Review in the circuit court for the county where the arrest occurred, not with the Department of Revenue.

I was arrested on the Kansas side of the state line. Does a Missouri deadline apply? No. Kansas runs a separate administrative process through the Kansas Department of Revenue, with its own 14-calendar-day window from the date of service of the officer's certification. Missouri deadlines do not apply to a Kansas arrest, and Kansas's deadline does not apply to a Missouri arrest.

Does the license deadline affect my criminal DUI case? No, and that is exactly what causes missed deadlines. The administrative license case and the criminal case move on separate schedules. A pending criminal case does not pause or extend the license deadline.

How do I figure out which deadline applies to me? Check which notice you received. A Notice of Suspension/Revocation tied to a test result points to the 15-day DOR hearing request. A Notice of Revocation tied to a refusal points to the 30-day circuit court petition. If you are not sure which one you have, that is worth confirming quickly.

Sources

• Missouri Department of Revenue: Driving While Intoxicated (DWI): 15-day administrative hearing request for test-failure suspensions/revocations.
• Missouri Department of Revenue: Administrative Alcohol FAQs: general administrative alcohol process and timing.
• Missouri Department of Revenue: FAQs, Refusal to Submit to an Alcohol and/or Drug Test: 30-day Petition for Review deadline for refusal revocations.
• Revised Statutes of Missouri, Section 302.574: the statute governing the one-year refusal revocation and the Petition for Review in circuit court.
• Kansas Department of Revenue, Division of Vehicles: Administrative Hearing Information: 14-day window to request a Kansas administrative hearing.

The takeaway

Missouri does not give every DUI arrest the same license deadline. A test failure means 15 days to request a DOR hearing. A refusal means a one-year revocation and 30 days to petition the circuit court. Kansas runs a separate 14-day process that does not apply on the Missouri side. Whichever situation matches your arrest, confirm the deadline early. Contact Aimee Gromowsky to talk through what deadline applies to your case.