Missouri HB 1740 DWI Penalties 2026: License Defense & First-Offense Guide
Quick Answer: Missouri HB 1740, effective August 28, 2026, expanded mandatory ignition-interlock requirements and increased felony penalties in DWI cases involving injury. A person found guilty of a first intoxication-related traffic offense involving a BAC of .15 or higher, property damage, or personal injury is subject to mandatory ignition-interlock requirements. The law also makes criminally negligent DWI causing physical injury a Class D felony and serious physical injury a Class C felony.
Being arrested for a DWI in Kansas City—whether you were pulled over after leaving the Power & Light District or leaving a tailgate at GEHA Field at Arrowhead Stadium—is a terrifying experience. In my almost 50 years of practicing in Kansas City, I have sat across from countless individuals who feel overwhelmed by the shame, the fear of a permanent mark on their background, and the anxiety of losing their license or facing new mandatory penalties.
A first-time arrest does not mean your life is over, and it does not mean you will face the maximum consequences under Missouri law. We can navigate this together. By examining the evidence, looking at the timeline of your arrest, and understanding how DWI cases are handled in Kansas City Municipal Court and the Jackson County Circuit Court, I can build a strategy that aims to mitigate the damage, protect your driving privileges, and help get your life back to normal.
Do I need an ignition interlock for a first-time DWI in Missouri?
Possibly—and under HB 1740 it is mandatory in certain first-offense cases. If you are found guilty of an intoxication-related traffic offense involving a BAC of .15 or higher, property damage, or personal injury, the court must require an ignition interlock. The device must be used for at least six months from the date your driver’s license is reinstated.
Even when none of those mandatory triggers applies, Missouri law still allows a court to order an ignition interlock for a first intoxication-related traffic offense.
HB 1740 also created a reduced-cost IID provision for qualifying individuals at or below 150% of the federal poverty level. A qualifying person who provides the required income verification is responsible for 10% of the device cost, although additional costs caused by noncompliance are not discounted.
Protecting your driving privileges requires acting quickly. If you received a Notice of Suspension/Revocation after a BAC test, you generally have only 15 days from the date the notice is issued to request a Department of Revenue administrative hearing. A chemical-test refusal follows a different procedure: a petition for review generally must be filed in circuit court within 30 days from the date the Notice of Revocation is issued. Learn more about Missouri’s license deadlines on my Kansas City DWI Defense page.
Is a first-offense DWI involving an injury a felony in Missouri?
Yes. Effective August 28, 2026, Missouri law provides that a DWI is a Class D felony when a person, while driving while intoxicated, acts with criminal negligence and causes physical injury to another person. If the conduct causes serious physical injury, the DWI is a Class C felony. These provisions can apply even without prior DWI convictions.
Facing an elevated felony charge can be paralyzing, but an arrest is not a conviction. The State still must prove the DWI, criminal negligence, causation, and the level of injury required for the charged offense. I scrutinize the state’s evidence—from the circumstances of the driving and the BAC evidence to the nature and extent of the alleged injury—to identify weaknesses that may reduce your exposure.
Property damage is different. Property damage can trigger the new mandatory ignition-interlock requirement, but property damage by itself is not the physical-injury element that makes a first DWI a felony under these provisions.
How does the new Missouri DWI law affect accidents causing death?
HB 1740 also made major changes to Missouri’s felony DWI provisions involving a death. As enacted, the amended statute contains an apparent overlap. One provision states that criminally negligent DWI causing the death of another person is a Class B felony, while another states that criminally negligent DWI causing the death of any person is a Class A felony.
The distinction is extremely important. The statute provides that a person convicted under the Class B death provision is not eligible for parole or probation until serving at least five years, while a person convicted under the Class A provision must serve at least ten years before becoming eligible.
Because the statutory provisions appear to overlap, the precise charge and sentencing exposure in a DWI death case requires careful review of the charging document, the facts, and developing Missouri law.
When the stakes are this high, having an attorney who understands the newly amended statute is vital. I use every available procedural protection and legal argument to challenge the state’s case and limit your exposure.
I got a DWI visiting Kansas City—do I have to return for court?
Not necessarily. Depending on the court, the charge, the stage of the case, and whether a personal appearance has been ordered, I may be able to handle some proceedings without requiring an out-of-state client to return to Kansas City. DWI cases are different from ordinary traffic tickets, however, and I would not promise a completely remote resolution until I have reviewed the case.
Immigration and international travel issues require special care. I am a criminal defense attorney, not an immigration lawyer. If you are not a United States citizen, or if you are worried about a visa, green card, reentry, Global Entry, TSA PreCheck, or future international travel, you should speak with a licensed immigration attorney before making plea, travel, or court decisions.
If you are dealing with a recent arrest, do not wait until critical deadlines have passed. Please contact my office with the specific details of your offense date, your BAC testing method, any alleged property damage, and your potential interlock indigency eligibility so I can begin reviewing the evidence immediately. Learn more about my background and approach by visiting the David M. Lurie Attorney Profile.