DUI Laws in Missouri: 0.08% BAC Limit (2026)

By Alex Harmon · Updated June 2026

Key Penalty Facts at a Glance

Overview of Missouri DWI Law

Missouri law prohibits operating a motor vehicle with a blood alcohol concentration (BAC) of 0.08% or higher. For drivers under 21, the state enforces a lower threshold of 0.02% under its zero-tolerance provisions. Commercial drivers must remain below the federal 0.04% BAC standard regardless of state law.

Missouri Revised Statute § 577.010 prohibits driving while intoxicated with a BAC of 0.08% or higher. First-offense DWI penalties include fines up to $500, up to 6 months in jail, and a 30-day license suspension. Missouri requires ignition interlock devices for all DWI convictions.

First-Offense DWI Penalties in Missouri

A first DWI conviction in Missouri carries the following consequences:

• Fine: Up to $500
• Jail time: Up to 6 months
• License suspension: 30 days
• Ignition interlock device: Required

Missouri uses the term DWI (Driving While Intoxicated). The state also has a BAIID (Breath Alcohol Ignition Interlock Device) program integrated into its administrative license suspension process. A prior out-of-state DWI conviction counts in Missouri within its lookback period. Under-21 drivers face a 0.02% BAC limit. Missouri law allows for a 90-day license suspension for refusal to submit to chemical testing.

Beyond these court-imposed penalties, a DUI arrest in Missouri will typically trigger an administrative license suspension through the state DMV — separate from the criminal case. This suspension begins shortly after arrest when a driver fails or refuses a chemical test. Drivers generally have a limited window (often 10–30 days) to request a hearing to contest the administrative suspension.

What Happens During a DWI Stop in Missouri?

During a DWI stop in Missouri, an officer who observes signs of impairment — bloodshot eyes, slurred speech, odor of alcohol — may ask you to perform standardized field sobriety tests (SFSTs). These include the Horizontal Gaze Nystagmus (HGN) test, the Walk-and-Turn test, and the One-Leg Stand test. If the officer determines there is probable cause, you will be asked to submit to a preliminary breath test (PBT) roadside, followed by an evidentiary breath or blood test at the station. Your right to remain silent applies — you are not obligated to answer questions beyond identifying yourself. However, refusing chemical testing triggers the implied consent suspension.

Ignition Interlock Device (IID) Requirements

An ignition interlock device (IID) is required for DWI convictions in Missouri. An IID is a breath-testing device installed in the vehicle that requires the driver to provide a clean breath sample before the engine will start. The device also performs rolling retests while driving. IID costs typically include installation ($70–$150), monthly monitoring fees ($60–$90), and removal costs. The IID requirement period varies based on offense history and BAC level.

CDL and Commercial Driver Rules

Commercial drivers operating in Missouri must adhere to the federal 0.04% BAC limit. A first DWI conviction results in a one-year CDL disqualification. A second DUI offense, or a first offense involving hazardous materials, triggers a lifetime CDL revocation. Commercial drivers cannot use the CDL Disqualification Petition for reinstatement after a second offense.

Implied Consent Law in Missouri

Like all 50 states, Missouri has an implied consent law. By operating a motor vehicle on public roads, drivers automatically consent to chemical testing (breath, blood, or urine) if lawfully arrested on suspicion of DWI. Refusal to submit to testing carries its own administrative consequences, including an automatic license suspension independent of the criminal case outcome. In some states, refusal can even be introduced as evidence of consciousness of guilt in the criminal proceeding.

Secondary Consequences of a DWI Conviction

Beyond the immediate legal penalties, a DWI conviction in Missouri carries significant secondary consequences. Auto insurance premiums can increase 50–100% or more, and many insurers require an SR-22 certificate of financial responsibility for three years post-conviction. Employment background checks will reveal a criminal conviction (for states where first-offense DUI is criminal). Certain professional licenses — nursing, law, commercial driving, teaching — may be affected. A DWI conviction can also affect custody arrangements, housing applications, and federal benefits eligibility.

• SR-22 insurance requirement for 3 years (major premium increases)
• Potential impact on professional licenses (nursing, law, CDL, real estate)
• Background check disclosure for employment applications
• Impact on custody and family law proceedings
• Possible federal consequences for federal employees or military personnel
• Increased scrutiny on future background checks for firearms purchases

Repeat Offense Escalation

Penalties in Missouri escalate significantly for repeat DWI offenders. A second offense within the state's lookback period typically results in longer mandatory jail sentences, higher fines, extended license revocation, and mandatory ignition interlock device installation. Three or more DUI offenses often trigger felony charges with state prison sentences rather than county jail. Repeat offenders may also face vehicle forfeiture in some circumstances.

Related Guides