In Missouri the offense is called DWI — driving while intoxicated — and the legal blood alcohol limit is 0.08% for drivers 21 and over, 0.04% for commercial drivers, and 0.02% for drivers under 21. A DWI arrest triggers two separate proceedings: a criminal case in court, and an administrative action against your driver\’s license through the Missouri Department of Revenue. You generally have only 15 days from the date of arrest to request a hearing on the license action.
That 15-day window is the most important fact on this page, and it is the one most people learn about too late.
Two cases, not one
This is what confuses almost everyone arrested for DWI in Missouri.
You can be found not guilty in the criminal case and still lose your license administratively, because the two proceedings are independent and the burden of proof is different. Both have to be defended.
The 15-day rule
When you are arrested for DWI in Missouri with a BAC at or above the limit, the officer typically takes your license and issues a temporary driving permit. That permit is not a favor — it is the start of a clock.
To contest the suspension, a written request for an administrative hearing has to be filed within 15 days. If it is not, the suspension proceeds automatically. There is no fixing this later, and no judge in the criminal case can undo it.
Refusing the breath test
Missouri operates under an implied consent law: by driving on Missouri roads you have already consented to chemical testing when an officer has reasonable grounds to believe you are intoxicated.
Refusing carries its own penalty, separate from any DWI conviction: a one-year revocation of your driving privileges. That revocation applies even if you are never convicted of DWI, and even if you would have blown under the limit.
People ask whether refusing is smart. There is no universal answer — it depends on what the officer already has, whether there is an accident or injury involved, your record, and whether a warrant for a blood draw is likely. What is universally true is that refusal is not a way to make the case disappear. It trades one problem for a different one. We cover the mechanics on our DWI defense page.
Penalties by offender level
Missouri escalates DWI penalties based on prior intoxication-related traffic offenses. The tier you land in drives everything else about the case.
Two things to understand about that ladder.
First, felony DWI levels carry minimum jail time that cannot be probated away in the ordinary sense. The statute restricts how much of the sentence a court can suspend. That is a meaningfully different negotiation than a first offense.
Second, a prior does not have to be a Missouri DWI conviction. Out-of-state convictions, certain municipal ordinance violations and other intoxication-related traffic offenses can count. If you have an old case from Kansas, it may well follow you across State Line Road. See our felony DWI page for how prior-offender status gets proven and challenged.
Beyond jail and fines
The sentence is rarely the part that hurts most. The collateral consequences are:
- SATOP. The Substance Abuse Traffic Offender Program is generally required before license reinstatement. Assessment, then a program placement that scales with the offense — at your cost.
- Ignition interlock. Required for reinstatement in many DWI cases, and for the full restricted-driving period in repeat cases. Installation plus monthly monitoring fees.
- Insurance. An SR-22 filing requirement, and premium increases that routinely outlast the probation.
- Employment. A DWI conviction is visible to employers. For CDL holders it can be career-ending — and the CDL limit is 0.04%, half the standard limit.
- Points. Points assess against your record, and accumulating enough triggers its own suspension independent of the DWI.
Under 21: zero tolerance
Missouri\’s \”Abuse and Lose\” framework sets the limit for drivers under 21 at 0.02% — roughly one drink. A BAC between 0.02% and 0.08% is not a full DWI, but it does trigger a license suspension. Above 0.08%, an underage driver faces the DWI charge as well.
For a college student or a new driver, the license consequence is usually the one that actually disrupts life, and it is the one worth fighting.
What can actually be challenged
A DWI case is not a single accusation. It is a chain, and every link has requirements the State has to meet.
- The stop. An officer needs reasonable suspicion to pull you over. A stop based on nothing more than leaving a bar parking lot at closing time is challengeable.
- The field sobriety tests. The standardized tests have specific administration protocols. Deviations affect reliability, and so do conditions — uneven ground, bad weather, injuries, footwear, age, medical conditions.
- The breath instrument. Missouri regulations require specific maintenance and calibration schedules, using approved solutions, documented on required forms. Maintenance records are obtainable and are not always in order.
- The observation period. An officer is required to observe the subject for a set period before the breath test to rule out mouth alcohol from burping or regurgitation. Skipping or shortening it is a real issue.
- The blood draw. Warrant requirements, chain of custody, who performed the draw and how the sample was stored.
- Rising BAC. Alcohol absorbs over time. A test taken 90 minutes after driving may show a higher level than at the moment you were behind the wheel.
None of these are magic words. They are places where a case is either solid or it is not, and you find out by getting the discovery and reading it.
What to do in the first 72 hours
- Find the date of arrest and count 15 days. That is your administrative hearing deadline.
- Locate the paperwork the officer gave you — the temporary permit and notice of suspension. Photograph everything.
- Write down what happened while it is fresh: where you were, what you drank and when, what you ate, what the officer said, what tests were given, weather and road conditions, any medical issues.
- Do not discuss the case with anyone but your attorney. Not on the phone from a jail line, not on social media.
- Note your court date and which court — municipal versus state court changes the process significantly.
- Talk to a lawyer before the hearing deadline, not after your first court appearance.
Municipal court vs. state court
In eastern Jackson County a DWI can land in a municipal court — Blue Springs, Independence, Grain Valley, Lee\’s Summit, Oak Grove — or in the 16th Circuit. It matters. Municipal cases can sometimes resolve to a non-alcohol-related amended charge that avoids the DWI record, depending on the city, the prosecutor and the facts. Circuit court cases, and anything with a prior, are a different negotiation entirely.
Knowing how a specific court and prosecutor handle these cases is not a small advantage. It is most of the job.
Common myths
\”I blew over, so there\’s nothing to fight.\” The number is evidence, not a verdict. Instrument maintenance, observation-period compliance and the legality of the stop are all live issues.
\”It\’s my first one, so I\’ll just get probation.\” Often, but not automatically — and probation still comes with SATOP, interlock, SR-22 and a conviction on your record.
\”The officer didn\’t read me my rights, so it gets thrown out.\” Miranda applies to custodial interrogation. It does not invalidate observations of driving, appearance or field sobriety performance.
\”A DWI can be expunged.\” Missouri does allow expungement of certain alcohol-related driving offenses in limited circumstances, with strict eligibility rules and long waiting periods — and CDL holders are treated differently. It is worth asking about, but it is not a plan. See our expungement page.
Frequently asked questions
What is the legal BAC limit in Missouri?
0.08% for drivers 21 and over, 0.04% for commercial driver\’s license holders, and 0.02% for drivers under 21.
Is it DUI or DWI in Missouri?
Missouri statutes use DWI — driving while intoxicated. \”DUI\” is used colloquially and by other states, but in a Missouri courtroom the charge is DWI.
How long do I have to act after a DWI arrest in Missouri?
Fifteen days from the date of arrest to request an administrative hearing with the Department of Revenue. If no request is filed in that window, the suspension takes effect automatically.
What happens if I refuse the breathalyzer in Missouri?
Under Missouri\’s implied consent law, refusal results in a one-year revocation of your driving privileges — separate from, and in addition to, any penalty in the criminal case.
Can a first-offense DWI be reduced in Missouri?
Sometimes. Outcomes depend on the court, the prosecutor, your record, the BAC level and whether there were aggravating facts such as an accident, injury or a child in the vehicle. A reduction is never guaranteed.
Will I go to jail for a first DWI in Missouri?
A first offense is a Class B misdemeanor carrying up to six months. Jail is possible but is not the typical outcome for a first offense without aggravating circumstances. No attorney can promise a particular result.
Does an out-of-state DUI count as a prior in Missouri?
It can. Missouri counts prior intoxication-related traffic offenses, and convictions from other states — including Kansas — may qualify. This is one of the most heavily litigated issues in repeat-offense cases.
Talk to a former prosecutor
Troy J. Leavitt is a former prosecutor who has spent over two decades in eastern Jackson County courtrooms — which means knowing how these cases are charged, and how they get resolved, from both sides of the table.
Call 816-228-6000 or contact the firm for a consultation. We defend DWI and DUI cases in Blue Springs, Independence, Lee\’s Summit, Grain Valley, Oak Grove and throughout the Kansas City metro.
This article is general information about Missouri law and is not legal advice. It does not create an attorney-client relationship, and no particular outcome is promised or implied. Statutes, penalties and local court practice change — consult a licensed Missouri attorney about your specific case.
Related reading: DWI defense attorney · DUI attorney in Blue Springs · Felony DWI · Traffic violations · DUI lawyer in Lee\’s Summit
