Missouri
Missouri state laws, regulations, court decisions, and active legislation
Overview
Missouri's legal system serves a geographically and politically diverse state that includes two major urban centers (St. Louis and Kansas City), suburban areas, and vast rural regions. The state legalized recreational marijuana through a 2022 constitutional amendment that included automatic expungement provisions for prior convictions. Missouri has been active in Second Amendment litigation, including the controversial Second Amendment Preservation Act.
Missouri's legal framework is generally conservative, with permitless carry, no state assault weapons ban, and strong self-defense protections. The state's location at the center of the country makes it a bellwether for national legal trends.
Court Structure
Missouri's court system includes municipal courts, associate circuit courts, circuit courts (organized into 46 judicial circuits), the Court of Appeals (three districts: Eastern, Western, and Southern), and the Missouri Supreme Court. In St. Louis and Kansas City, appellate and Supreme Court judges are selected through the Missouri Plan (nonpartisan court plan) — the original merit-based selection system adopted in 1940 that has been replicated nationwide.
Unique Laws & Facts
- •Missouri pioneered the merit-based judicial selection system (Missouri Plan, 1940)
- •The Second Amendment Preservation Act attempted to nullify federal gun laws (enjoined by courts)
- •Missouri's recreational marijuana amendment includes automatic expungement provisions
- •The state is one of few that allow constitutional carry at age 19
- •Missouri's castle doctrine covers homes, vehicles, and places of business
Legal Landscape
Missouri's legal landscape reflects its centrist-to-conservative orientation with strong Second Amendment protections, a new recreational cannabis market, and the influential Missouri Plan for judicial selection. The state's legal system navigates significant urban-rural divides, particularly between St. Louis/Kansas City and the rest of the state.
Key Missouri Laws (3)
Driving While Intoxicated
Missouri's DWI threshold is 0.08% BAC with aggravated at 0.15%. First offense is a Class B misdemeanor with up to 6 months in jail, $500 fine, and 90-day license suspension. A 5-year lookback applies. Two or more prior offenses elevate the charge to a felony.
Permitless Carry and Second Amendment Preservation Act
Missouri allows permitless concealed carry for those 19+. The state attempted to invalidate federal gun laws through SAPA, though courts have enjoined this. No assault weapon bans, magazine limits, waiting periods, or universal background checks. Strong self-defense protections apply.
Recreational Marijuana Legalization (Amendment 3)
Missouri legalized recreational marijuana in 2022 for adults 21+. Possession up to 3 ounces, home cultivation of 6 plants with license. 6% excise tax. Comprehensive automatic expungement of prior offenses. Municipalities may zone but not ban cannabis businesses.