DUI Laws in Missouri (DWI)

Overview

Missouri uses the term DWI (Driving While Intoxicated) and has a tiered system with increasingly severe penalties for repeat offenders. The state is notable for its relatively high BAC threshold for enhanced penalties (0.15%) and its 5-year lookback period for misdemeanor offenses, though Missouri uses a lifetime lookback for felony determination — any prior alcohol-related enforcement contact counts toward the chronic/habitual offender thresholds. A third DWI is classified as a persistent offender (Class E felony), and a fourth becomes a Class C felony as a chronic offender. Missouri also stands out for its Substance Abuse Traffic Offender Program (SATOP), which is mandatory for all DWI offenders and tailored to the offender's assessed risk level.

Official term: DWI

BAC Limits

Penalties by Offense

Felony threshold: 3rd offense (persistent offender — Class E felony); 4th offense (chronic offender — Class C felony); uses lifetime lookback for all prior alcohol-related enforcement contacts. Lookback period: 5 years for misdemeanor penalty enhancement; lifetime lookback for felony determination (persistent, chronic, and habitual offender status counts all prior alcohol-related enforcement contacts).

Additional Penalty Details

Implied Consent Law

Under Missouri's implied consent law (Mo. Rev. Stat. §577.020), any person operating a motor vehicle in Missouri is deemed to have consented to chemical testing (breath, blood, saliva, or urine) when arrested for a DWI-related offense with probable cause. Missouri permits both breath and blood testing, and officers may request a blood test if breath testing is unavailable or the subject is incapacitated.

Refusal penalties: First refusal: 1-year license revocation (administrative, by DOR). If the person has a prior alcohol-related offense: 1-year revocation. Refusal can be used as evidence at trial. The officer may seek a warrant for a blood draw after refusal. Refusing also results in denial of any limited driving privilege for 90 days.

Aggravating Factors

DUI with Injury

Classification: Felony — Assault While Intoxicated / DWI Death

Assault while intoxicated causing serious physical injury (Mo. Rev. Stat. §565.060): Class D felony, up to 7 years imprisonment and $10,000 fine. DWI death — causing death while intoxicated (Mo. Rev. Stat. §565.024): Class B felony, 5–15 years imprisonment. Involuntary manslaughter while intoxicated (Mo. Rev. Stat. §565.027): Class C felony, up to 7 years. These are among the most serious charges in Missouri's criminal code.

Underage DUI

Drivers under 21 with a BAC of 0.02%–0.079% face Missouri's zero-tolerance law: first violation — 90-day license suspension (30-day hard suspension + 60 days restricted). Second violation — 1-year revocation. These are administrative penalties through the Department of Revenue, separate from any criminal charges. If the underage driver's BAC is 0.08%+, full criminal DWI charges and adult penalties apply in addition to the administrative zero-tolerance sanctions.

Diversion Programs

Program: SATOP / DWI Court

Missouri's SATOP (Substance Abuse Traffic Offender Program) is mandatory for all DWI offenders and provides education and treatment tailored to assessed risk level. The program has multiple levels: OWLS (education for lowest risk), Weekend Intervention Program (WIP), Outpatient Treatment (CL), and Clinical Treatment (CT). Additionally, Missouri operates DWI Courts in many circuits that provide intensive treatment-based supervision as an alternative to incarceration for repeat offenders. Some prosecutors offer SIS (Suspended Imposition of Sentence) for first offenders, which can keep the conviction off the permanent record.

Eligibility: SATOP is mandatory for all DWI offenders — the program level is determined by risk assessment. DWI Court is typically available for repeat offenders (2nd or 3rd offense) who demonstrate a substance use disorder. SIS may be available for first-time offenders at the prosecutor's and judge's discretion. Cases involving death or serious injury are generally excluded from diversion options.

How Long a DUI Stays on Your Record

A DWI conviction remains on your Missouri criminal record permanently unless expunged. Missouri allows expungement of certain DWI convictions: a first-offense misdemeanor DWI may be eligible for expungement after 10 years under Mo. Rev. Stat. §610.140, provided the person has had no subsequent alcohol-related offenses and meets all other eligibility criteria. An SIS (Suspended Imposition of Sentence) does not result in a conviction if completed successfully, though it remains visible on court records. For driving record purposes, DWI convictions remain for 5 years for point purposes but the DOR maintains lifetime records of all alcohol-related contacts for offender classification.

Key Statutes

Mo. Rev. Stat. §577.010

Driving while intoxicated — defines the DWI offense, BAC limits, and elements of the crime

Mo. Rev. Stat. §577.023

Prior offender, persistent offender, chronic offender, habitual offender — escalating classifications and felony penalties based on prior DWI history

Mo. Rev. Stat. §577.020

Implied consent — chemical testing requirements, refusal penalties, and warrant provisions for blood draws

Mo. Rev. Stat. §565.024

Involuntary manslaughter — includes DWI-related death penalties (Class B felony)

Mo. Rev. Stat. §302.304–302.309

License suspension and revocation — administrative penalties, point system, and restricted driving privilege provisions for DWI

Related

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