Underage DUI Laws In Missouri

Finder Law Serves Clients Across Jefferson City, Columbia, and Central Missouri

Kara McNabb • May 20, 2025

Understanding Underage DUI Laws in Missouri

Driving under the influence (DUI) is a serious offense, and it is particularly concerning when the individual involved is under the legal drinking age. In Missouri, the legal drinking age is 21, and any violation of this law can have significant consequences, especially when it comes to operating a vehicle. Underage DUI laws are designed to deter young drivers from drinking and driving and protect public safety.



If you're a minor in Missouri who has been arrested for driving under the influence, understanding the specifics of the state's underage DUI laws is crucial. This blog post will provide a breakdown of what underage DUI means in Missouri, the legal consequences, and how minors can defend themselves in such cases.

What Constitutes an Underage DUI in Missouri?

In Missouri, the law defines DUI as operating a vehicle with a blood alcohol concentration (BAC) of 0.08% or higher for individuals over the age of 21. However, for drivers under the age of 21, the legal threshold for BAC is much lower.


Under Missouri's underage DUI law, drivers under 21 are considered to be driving under the influence if their BAC is 0.02% or higher. This means that even consuming a small amount of alcohol—such as a single drink—can lead to a DUI charge.


Additionally, the law applies even if the minor does not show signs of impairment. For example, if a teenager is caught driving with a BAC of 0.02% or above, they can be arrested and charged with underage DUI, even if they are not exhibiting any signs of drunkenness.

Legal Consequences of Underage DUI in Missouri

Missouri enforces strict penalties for underage DUI offenses. Depending on the circumstances, consequences may include criminal penalties, administrative actions (such as the suspension of a driver's license), and long-term effects on the minor's criminal record.

1. Criminal Penalties

For underage drivers arrested with a BAC of 0.02% or more, Missouri law treats this as a criminal offense, and the penalties can vary. Some common penalties for an underage DUI conviction include.

  • Fines: A fine can range from $250 to $1,000, depending on the severity of the offense and whether there are any aggravating circumstances (e.g., previous DUI offenses or accidents).
  • Jail Time: While jail time is typically reserved for more severe offenses, some minors may face up to 1 year in jail for a second or subsequent DUI offense.
  • Probation: Instead of serving jail time, a minor may be placed on probation, which could include mandatory alcohol counseling, community service, or other requirements.

2. License Suspension

One of the most immediate consequences of an underage DUI conviction is the suspension of the driver's license. Missouri imposes a mandatory license suspension for minors who are arrested for DUI, and the length of the suspension depends on the circumstances:

  • First Offense: A first-time underage DUI conviction typically results in a 30-day suspension of the driver's license.
  • Second Offense: A second offense could lead to a suspension of up to 90 days.
  • Third Offense: If the individual has been convicted of underage DUI multiple times, the suspension period could be one year or more.

Even if the minor does not have a driver’s license, the court may impose restrictions on obtaining a license in the future.

3. Points on Driving Record

Convictions for underage DUI can also result in points being added to the minor's driving record. Accumulating too many points can lead to a longer license suspension or even the revocation of driving privileges in the future.

Defenses Against Underage DUI Charges in Missouri

Even though the penalties for underage DUI are severe, there may be possible defenses to these charges. Some common defenses include:

1. Lack of Probable Cause for the Stop

In Missouri, police officers are required to have a valid reason to stop a vehicle. If an officer stops a vehicle without reasonable suspicion or probable cause, any evidence obtained during the stop, including breathalyzer results, could be inadmissible in court. If the arresting officer did not have sufficient grounds to stop the driver in the first place, the charges could be dropped.

2. Faulty Breathalyzer or Field Sobriety Test Results

Breathalyzer machines can malfunction, and field sobriety tests can be inaccurate, especially if the minor was nervous, tired, or impaired by factors unrelated to alcohol (e.g., medications or a medical condition). If there are issues with the accuracy of the test or if the test was administered improperly, the defense may argue that the evidence is unreliable.

3. No Alcohol in the System

The BAC level required for underage DUI charges is as low as 0.02%. However, if there is a chance that the BAC test was not accurate or that alcohol was not present in the minor’s system at the time of arrest, it may be possible to argue that the DUI charge should not stand.

4. Improper Administration of the Test

There are specific protocols law enforcement must follow when conducting breath or blood tests. If those procedures were not followed correctly, it could provide a basis for challenging the DUI charge.

What to Do If You Are Arrested for Underage DUI

If you or someone you know is arrested for underage DUI in Missouri, it's essential to take the situation seriously. Here are some steps to take:

  • Contact an Attorney: A qualified DUI defense attorney can help navigate the complexities of underage DUI laws in Missouri and work to minimize the consequences. They can challenge the evidence, negotiate with prosecutors, and, if necessary, represent the defendant in court.
  • Prepare for a Hearing: If the minor’s license was suspended due to the DUI arrest, a hearing will be required to challenge the suspension. Your attorney can help prepare for this hearing and present arguments for reinstating driving privileges.
  • Attend Alcohol Education Programs: In many cases, courts may require minors charged with underage DUI to attend alcohol education programs or treatment. Complying with these programs may help reduce penalties or lead to more favorable outcomes in court.

Conclusion

Underage DUI offenses in Missouri carry serious legal consequences, including criminal penalties, license suspensions, and the potential for long-term effects on a minor's future. If you are facing underage DUI charges, it’s essential to seek legal advice from an experienced DUI attorney to understand your rights, explore possible defenses, and work toward the best possible outcome. With over 10 years of experience in criminal defense, Daniel Finder at Finder Law, LLC has helped countless clients fight criminal charges, such as underage DUIs.


Call our office today to set up a time to discuss your case with our attorney and ensure your rights are protected.


It’s crucial for both parents and minors to understand the gravity of driving under the influence. The best way to avoid the consequences of underage DUI is to never get behind the wheel after drinking. Stay safe, and make responsible decisions to protect your future.

This blog is for informational purposes only and does not constitute legal advice. For specific guidance, please contact our office directly.

Options for Missouri Business Owners to Collect Unpaid Debts

By Alyssa Finder • February 18, 2026
Running a business in Missouri often involves extending credit to customers, clients, or other businesses. While most customers pay their bills on time, unpaid debts can create significant cash flow issues and affect the overall health of your business. Fortunately, Missouri law provides several avenues for business owners to pursue collection of unpaid debts.  Understanding your options and the proper legal procedures can help you recover the money you are owed efficiently and effectively.

Cooper County Car Crash

By Alyssa Finder • February 13, 2026
A two-vehicle crash occurred on Wednesday evening on I-70 in Cooper County. At 5:48 pm, a Sedalia man driving a 2012 Nissan Frontier went off the roadway on Westbound I-70 in Cooper County to avoid the driver of a 2021 Westenstar 4700. The Nissan then went off the right side of the roadway and overturned. The driver of the 2021 Westenstar 4700 was taken to University Hospital by ambulance with minor injuries. Highway crashes are often especially dangerous because of higher speeds, heavier traffic, and limited reaction time, which can turn even a brief mistake into a serious collision. Victims frequently suffer traumatic brain injuries, spinal and neck injuries, broken bones, and internal injuries that may require extensive medical treatment and time away from work. If you or a loved one has been hurt in a highway crash, contact Daniel Finder at Finder Law, LLC to discuss your legal options and pursue the compensation you deserve. All facts of the incident are based on preliminary reporting done by The Missouri State Highway Patrol.

Montgomery County Car Crash

By Alyssa Finder • February 13, 2026
A staff member suffered minor injuries when a Montgomery County school bus was hit by a car Wednesday morning. The Montgomery County R-2 bus was hit at about 7:30 a.m. on Highway 19 near Route WW just north of New Florence, according to a Missouri State Highway Patrol crash report. A Hyundai Elantra driven by a 35-year-old Wellsville woman hit the bus after crossing the center line, the patrol reported. The Hyundai driver was taken by ambulance to Lake St. Louis Hospital with moderate injuries. The injured school employee, 63, of High Hill, was taken to the Hermann Area District Hospital with minor injuries. The one student on the bus was not hurt, said Superintendent Brian White. When a vehicle crosses the center line on a highway, the resulting crash is often violent due to high speeds and the risk of a head-on impact. These collisions frequently cause traumatic brain injuries, neck and spinal injuries, broken bones, internal organ damage, and severe soft-tissue injuries that can have lasting effects. In the most serious cases, victims are left facing long-term medical care, lost income, and permanent disabilities. If you or a loved one has been injured in a center-line crash, contact Daniel Finder at Finder Law, LLC to discuss your legal options and protect your right to full compensation. All facts of the incident are based on preliminary reporting done by The Missouri State Highway Patrol and KMIZ.

Navigating Custody Disagreements After a Modification in Missouri

By Alyssa Finder • February 11, 2026
Custody arrangements in Missouri are designed to be flexible to reflect the best interests of the child. Even after a court has modified a parenting plan, disagreements between parents can still arise. Issues such as extracurricular activity costs, changes in school or school districts, and other daily parenting decisions can create tension and confusion.  Understanding how to navigate custody disagreements after a modification can help parents protect their rights and maintain stability for their children.

Cole County Pedestrian Injury

By Alyssa Finder • February 11, 2026
A vehicle hit a pedestrian on a Cole County road Friday morning, closing it for an hour. Sgt. Kyle Green with the Missouri State Highway Patrol said troopers were investigating the pedestrian crash on Route Y near Helias Road just after 9 a.m. Green said the pedestrian was hurt, but he did not know the severity of those injuries. An ABC 17 News photographer on scene saw law enforcement and Cole County EMS. A photographer said first responders opened the road back up just after 10 a.m. A Missouri State Highway Patrol crash report says a 39-year-old Gravois Mills man was seriously injured in the crash and was brought to University Hospital by ambulance. The report says a 21-year-old Jefferson City man drove a 2008 Chevrolet Impala and failed to yield to a stationary vehicles stopped in the roadway. The man drove the Chevrolet across the center of the roadway and hit the pedestrian, the report says. An MSHP spokesman told ABC 17 News that the pedestrian was hit after they stepped off a trash truck. The Chevrolet had extensive damage and the driver had no reported injuries. When a pedestrian is struck by a vehicle, the results are often catastrophic. Without the protection of a car’s frame, even a low-speed impact can cause devastating injuries such as fractures, internal trauma, or permanent disability. Medical costs, lost income, and long-term recovery can quickly become overwhelming. If you or someone you love has been hit by a car, you don’t have to face the aftermath alone— contact Daniel Finder at Finder Law, LLC for skilled personal injury representation and compassionate guidance every step of the way. All facts of the incident are based on preliminary reporting done by The Missouri State Highway Patrol and KMIZ.

Montgomery County Single Car Crash

By Alyssa Finder • February 11, 2026
Two men were seriously injured Wednesday afternoon in a pickup truck crash on Missouri Route 19 in Montgomery County. A 60-year-old Owensville man was severely injured Wednesday afternoon in a single- vehicle accident on Missouri Route 19 in Montgomery County. According to a Missouri State Highway Patrol (MSHP) crash report, the incident happened around 4:09 p.m. when a southbound 2015 Toyota Tundra pickup truck ran off the roadway near Loutre Bend Road, careened down an embankment, and crashed into multiple trees. A passenger, identified as a 60-year-old Owensville man, was ejected and severely injured. He was transported to University Hospital for treatment. The 28-year-old St. Clair man driving was brought to Mercy Hospital. Car crashes can cause devastating injuries. A momentary distraction can lead to serious consequences such as broken bones, spinal damage, or traumatic brain injuries—often leaving victims with lasting pain and financial strain. If you or a loved one has been injured, contact Daniel Finder at Finder Law, LLC to discuss your rights and explore your options for recovery. All facts of the incident are based on preliminary reporting done by The Missouri State Highway Patrol and The Legal Advocate.

Understanding Contempt of Court in Missouri: What It Means and Consequences

By Alyssa Finder • February 4, 2026
Being held in contempt of court in Missouri is a serious legal matter that can have significant consequences. Contempt occurs when an individual disobeys a court order, disrupts court proceedings, or otherwise fails to comply with the authority of the court. Understanding the types of contempt, reasons someone may be held in contempt, and the potential consequences is essential for anyone involved in legal proceedings.

Breach of Contract Cases in Missouri: What You Need to Know

By Alyssa Finder • January 28, 2026
Contracts are a fundamental part of everyday life and business in Missouri. From employment agreements and real estate transactions to service contracts and business partnerships, contracts help define each party’s rights and obligations. When one party fails to live up to their end of the bargain, a breach of contract may occur —often leading to financial loss, disputes, and potential litigation. If you believe a contract has been breached, understanding Missouri contract law and your legal options is an important first step.

Morgan County Car Crash

By Alyssa Finder • January 28, 2026
A rear-end accident along MO-52 left two men injured on Wednesday afternoon near Quarry Ln, prompting a response from area emergency services. According to the Missouri State Highway Patrol, the crash occurred at approximately 3:30 p.m. when a 2023 Ford Transit van, driven westbound by a 33-year-old man from Eldon, struck the rear of a 2001 Dodge Dakota that was stopped in the westbound lane. The impact caused significant damage to both vehicles, with the Dakota sustaining total damage. Both came to rest on the roadway facing westbound. The driver of the Dodge, a 72-year-old man from Versailles, was not wearing a seatbelt and sustained moderate injuries. He was transported by Mid-Mo Ambulance to Lake Regional Hospital for further treatment. The Ford driver initially refused care but was later listed with moderate injuries and taken to the same facility. Garbers Towing removed both vehicles from the scene as troopers with Troop F completed their investigation. The cause of the crash remains under review. Rear-end crashes may seem minor at first, but they often cause serious and lasting injuries. Victims commonly suffer whiplash, neck and back injuries, herniated discs, concussions, spinal injuries, and soft-tissue damage that can worsen over time. The sudden force of being struck from behind can also lead to chronic pain, limited mobility, and missed time from work, even when vehicle damage appears minimal. If you or a loved one was injured in a rear-end collision, call Daniel Finder at Finder Law, LLC to discuss your options and get experienced personal injury representation. All facts of the incident are based on preliminary reporting done by The Missouri State Highway Patrol.

Audrain County Car Crash

By Alyssa Finder • January 27, 2026
Missouri State Highway Patrol troopers are investigating a crash that left one person dead involving two tractor trailers and one SUV, according to MSHP Troop F Sgt. Kyle Green. The crash happened between Centralia and Mexico on Missouri 22, near Audrain Road 215, according to an MSHP post. As of 9 a.m. Wednesday, the Missouri Department of Transportation planned to keep the highway closed for at least four more hours, according to Little Dixie Fire Protection District Chief Jason Henry. Emergency crews were first dispatched on reports of a semitruck on fire a few hours earlier that morning, Henry said. They were then paged again, but this time on reports of a second semitruck being rolled over and an SUV involved in the crash, according to the fire chief. Henry told KOMU 8 it appeared the SUV driver was ejected from the vehicle, adding the scene remains active. KOMU 8 was on the scene and saw one of the trucks involved was an Ameren vehicle. When a car is hit by a semi-truck, the sheer size and weight of the truck often lead to catastrophic injuries. Victims may suffer traumatic brain injuries, spinal cord damage, crushed or broken bones, internal organ injuries, severe burns, and permanent disabilities, even in crashes that happen at relatively low speeds. These collisions frequently result in long recovery periods, overwhelming medical bills, and time away from work, while trucking companies and insurers move quickly to protect themselves. If you or someone you love has been injured in a crash involving a semi, call Daniel Finder at Finder Law, LLC to protect your rights and pursue the personal injury compensation you deserve. All facts of the incident are based on preliminary reporting done by The Missouri State Highway Patrol and KOMU.