Missouri DWI Laws
(Complete 2026 Guide)

Missouri’s DWI laws carry real consequences. Some are manageable. Others can change your life. A conviction can mean jail time, steep fines, and the loss of your driver’s license. And that’s before you deal with the administrative actions the Department of Revenue will take against you.

For nearly twenty years, I’ve defended people charged with DWI in Missouri’s state and municipal courts in and around the St. Louis area, including St. Louis County, St. Charles County, Jefferson County, Franklin County, and many others. I understand the law and penalties. And I know what it takes to keep you out of jail and protect your license. Being arrested does not mean you’ve been proven guilty. The State still has to prove its case, and you have the right to make them do it.

Sometimes a case ends in a dismissal. Other times a client chooses the certainty of a plea agreement over the risk of trial. Either way, my job is the same: use the law, the facts, and the latest developments in Missouri DWI practice to protect you and minimize the consequences.

The law changes constantly. An attorney who doesn’t keep up with it can cost you your freedom and your license. I make it a point as a DWI Defense attorney to stay current so I can defend you with the most up‑to‑date information and proven strategies.

Understanding Missouri DWI Laws

How Missouri Defines Driving While Intoxicated

Missouri law makes it illegal to operate a motor vehicle while in an intoxicated or drugged condition. That includes alcohol, prescription medication, illegal drugs, or any combination of substances that impair your ability to drive safely.

BAC Limits in Missouri

• 0.08% for drivers 21 and older

• 0.02% for drivers under 21

• 0.04% for commercial drivers

A BAC at or above these levels can be used against you in both criminal court and administrative proceedings.

What the State Must Prove

To convict you of DWI, the State must show:

1. You were operating a motor vehicle, and

2. You were intoxicated or drugged at the time.

Criminal vs. Administrative Penalties

A DWI arrest triggers two separate cases:

• A criminal case handled by a prosecutor

• An administrative case handled by the Department of Revenue

You can win one and lose the other. You can also lose both if you don’t act quickly.

Criminal Penalties for DWI in Missouri

Missouri classifies DWI offenses as either misdemeanors or felonies depending on your prior history and the circumstances of the arrest. As your number of prior offenses increases, so do the penalties.

Below are the statutory penalties for each offense level. These are taken directly from Missouri law and reflect what you are facing if convicted.

First DWI in Missouri (Class B Misdemeanor)

Second DWI in Missouri (Class A Misdemeanor)

Third DWI in Missouri (Class E Felony — Persistent Offender)

Fourth DWI in Missouri (Class D Felony — Aggravated Offender)

Fifth DWI in Missouri (Class C Felony — Chronic Offender)

Sixth DWI in Missouri (Class B Felony — Habitual Offender)

Seventh DWI or More in Missouri (Class A Felony)

Administrative Penalties and License Consequences

A DWI arrest triggers immediate action by the Department of Revenue. You have 15 days to request an Administrative Hearing or 30 days to file a Petition for Review. If you do nothing, your license will be suspended or revoked after 15 days in either condition.

What Happens After a DWI Arrest

You will receive a 15‑day Temporary Driving Permit. After that, your driving privileges will be suspended unless you act.

If You Blew (Submitted a Breath Sample)

If you provide a breath sample, the State will have a record of your BAC. As your notice states:

If you are found to have a BAC of 0.08% (for those 21 and over or 0.02% for those under 21) you will be served a notice of loss of your driving privileges…

At the Administrative Hearing, two issues are decided:

1. Whether you were arrested on probable cause

2. Whether your BAC was at or above the legal limit

This is a low burden for the State and most people lose; however, an expericenced DWI Defense lawyer knows how to challenge the evidence in an Administrative Hearing. I have won countless challenges to BAC results over the years.

If You Refused (Breathalyzer Refusal)

Refusing a breath test triggers a one‑year revocation unless you file a Petition for Review within 30 days to challenge the breathalyzer refusal revocation, though your temporary driving permit is good for only 15 days.

At the refusal trial, the court decides:

1. Whether you was arrested or stopped;

2. Whether the officer had:

   1. Reasonable grounds to believe that you were driving a motor vehicle while in an intoxicated or drugged condition; or

   2. Reasonable grounds to believe that you were stopped, or being under the age of twenty-one years, you were driving a motor vehicle with a blood alcohol content of two-hundredths of one percent or more by weight; or

   3. Reasonable grounds to believe that you were stopped, or being under the age of twenty-one years, you were committing a violation of the traffic laws of the state, or political subdivision of the state, and such officer had reasonable grounds to believe, after making such stop, that you had a blood alcohol content of two-hundredths of one percent or greater; and

3. Whether you refused to submit to the test.

A successful challenge reinstates your license. That said, this is a very difficult burden for the driver to overcome; however, with my knowledge of DWI laws I often win Refusal Revocation cases for my clients.

Special Rules for Drivers Under 21 (Abuse and Lose)

Missouri imposes additional penalties on drivers under 21. As your document states:

“If you are under 21 years of age the court may order your driving privilege be suspended for 90 days… or revoked for one year…”

These penalties apply to:

• Alcohol‑related traffic offenses

• Possession or use of alcohol while driving

• Drug‑related offenses

• Fake ID violations

Drivers 21 and older can also face a one‑year revocation for drug possession while driving.

How an Experienced Missouri DWI Attorney Can Help

Whether it’s your first DWI or your fifth, this is a serious matter. You need someone who knows the law, understands the penalties, and is willing to fight for you.

I’ve spent my career studying Missouri DWI laws, staying current on new developments, and challenging the State’s evidence. Sometimes that means filing motions to suppress illegally obtained evidence. Sometimes it means negotiating a plea that protects your future. Whatever your situation, I will put my experience to work for you.

Frequently Asked Questions

What happens when you get a DWI for the first time?

You face a Class B misdemeanor, possible jail time, fines, and a 90‑day license suspension. See the First DWI table above.

How much jail time for a second DWI?

A second DWI carries a minimum of 10 days in jail, though community service is often substituted.

What is a Persistent, Aggravated, Chronic, or Habitual Offender?

These are statutory classifications based on your prior DWI history. They determine whether your charge is a misdemeanor or a felony and how severe the penalties will be.

Can I keep my license after a DWI arrest?

Yes, but only if you act quickly. You have 15 days to request an admnistrative hearing or 30 days file a Petition for Review (but your temporary license is good for only 15 days).

Speak With a DWI Defense Lawyer

If you’ve been arrested for DWI in Missouri, you don’t have time to wait. Your license is already at risk. The State is building its case and preparing charges. Contact my office today, and I’ll start protecting your rights immediately.