DWI First Offense Penalties in Missouri in MO — Dui Legal Guide | CGMIMM

## What happens after a first-offense DWI in Missouri? In Missouri, the legal BAC limit is **0.08**. Drivers under 21 are subject to a near-zero limit. Commercial drivers are limited to 0.04. If you're charged with a first DWI, here's the framework. ### Classification Class B misdemeanor. ### Jail Up to 6 months (jail rarely imposed on a true 1st; probation typical). ### License suspension 30 days hard suspension + 60 days restricted = 90 days total. ### Ignition interlock device (IID) Discretionary on a 1st offense; required after the suspension if eligible. ## What aggravators do The framework above describes a basic, no-aggravator first offense. The penalties get worse — fast — when any of these are present: - **High BAC** — most states pile on extra mandatory jail and IID time once BAC crosses 0.15 or 0.20 - **Child in the vehicle** — many states elevate the charge or add mandatory jail - **Accident, especially with injury** — can convert a misdemeanor into a felony - **Refusing the breath/blood test** — usually triggers a longer license suspension on its own, separate from the criminal case ## You're fighting two cases, not one A DUI/DWI arrest sets two parallel processes in motion: 1. **The criminal case** — where the prosecutor has to prove you were impaired beyond a reasonable doubt. 2. **The administrative license case** — handled by the state DMV/MVD, with a much lower burden of proof and a tight deadline (often 7–30 days from arrest) to request a hearing or you lose your license by default. Missing the administrative deadline is one of the most common, costly mistakes. Talk to a lawyer immediately, not after your court date. ## Diversion, deferred adjudication, and pretrial alternatives Many states (and many local prosecutors in Missouri) offer first-offense alternatives — diversion, deferred judgment, ARD, 24D, treatment programs — that can avoid a permanent conviction. Eligibility is fact-specific (BAC, driving history, accident, refusal). A local DUI defense attorney will know what your county's prosecutor offers. ## What you should do Don't plead guilty at your first appearance without talking to a lawyer. DWI cases have technical defenses (calibration of the breath device, traffic-stop legality, blood-draw chain of custody, field-sobriety test administration) that can change the outcome. Most Missouri DUI defense attorneys offer free consultations. --- *This guide is general information about Missouri DWI law as of early 2026 and is not legal advice. Penalties shift, prosecutors have discretion, and your specific facts will change the analysis. Talk to a licensed Missouri criminal-defense attorney about your case before making decisions.*