Criminal Defense Law in Missouri: Overview
Missouri has a well-defined felony classification system with five classes (A through E) and has undergone significant criminal justice changes in recent years, including the legalization of recreational marijuana through Amendment 3 in 2022. The state uses the term DWI (Driving While Intoxicated) and employs a prior offender, persistent offender, and chronic offender classification system for repeat DWI offenses. Missouri is a castle doctrine state with a strong stand your ground provision codified by statute. The death penalty remains authorized for first-degree murder, and Missouri is one of the more active states in carrying out executions. Missouri expanded its expungement law significantly in 2018 and again in 2021, making many more offenses eligible for record clearing. The state does not have a traditional three-strikes law but allows enhanced sentencing for prior and persistent offenders.
Key Statutes & Deadlines
DWI First Offense (Class B Misdemeanor)
Up to 6 months in jail, up to $500 fine, 30-day license suspension
Mo. Rev. Stat. § 577.010
Recreational Marijuana
Legal for adults 21+; up to 3 oz, home cultivation of 6 plants per adult
Mo. Const. Art. XIV, § 2
Felony Classification
Class A (10-30 yrs/life), B (5-15 yrs), C (3-10 yrs), D (up to 7 yrs), E (up to 4 yrs)
Mo. Rev. Stat. § 558.011
Castle Doctrine / Stand Your Ground
No duty to retreat in dwelling, vehicle, or any location where lawfully present
Mo. Rev. Stat. § 563.031
Expungement Statute
Most offenses eligible after 3 years (misdemeanor) or 7 years (felony) waiting period
Mo. Rev. Stat. § 610.140
DWI Offender Classifications
Missouri classifies DWI offenders based on their history. A first DWI offense is a Class B misdemeanor carrying up to 6 months in jail and a $500 fine. A "prior offender" (one previous intoxication-related offense) faces a Class A misdemeanor with up to 1 year in jail. A "persistent offender" (two prior offenses) is charged with a Class E felony carrying up to 4 years in prison. A "chronic offender" (three or more prior offenses) faces a Class B felony with 5-15 years in prison. Missouri uses a lifetime lookback, so all prior offenses count regardless of when they occurred. The legal BAC limit is 0.08% for adults, 0.04% for commercial drivers, and Missouri has a zero-tolerance policy for drivers under 21 (0.02% results in administrative license suspension). Aggravated offenses involving injury or death can be charged as assault or manslaughter.
Stand Your Ground and Castle Doctrine
Missouri enacted comprehensive self-defense reforms in 2016 (SB 656) that codified stand your ground principles. Under Mo. Rev. Stat. § 563.031, a person has no duty to retreat before using force, including deadly force, in any location where they are lawfully present if they reasonably believe such force is necessary to protect themselves or another from death, serious physical injury, or any forcible felony. The castle doctrine provides a presumption that deadly force was reasonable when used against a person unlawfully entering a dwelling, residence, or occupied vehicle. This presumption does not apply if the person against whom force was used had a legal right to be in the dwelling or if the person using force was engaged in criminal activity. Missouri law also provides civil immunity for justified uses of force.
Marijuana Legalization and Automatic Expungement
Missouri voters approved Amendment 3 in November 2022, legalizing recreational marijuana for adults 21 and over. Adults may possess up to 3 ounces and cultivate up to 6 flowering plants, 6 nonflowering plants, and 6 clones per individual at home. The amendment also included a groundbreaking automatic expungement provision for individuals with prior marijuana offenses for conduct that is now legal. Individuals serving sentences for eligible marijuana offenses could petition for release and resentencing. The Missouri Division of Cannabis Regulation oversees the licensed market. Marijuana remains illegal in public spaces beyond personal possession limits, and driving under the influence of marijuana remains a DWI offense.
Missouri Court System
Missouri has a tiered court system. Municipal Courts handle ordinance violations. Associate Circuit Courts handle misdemeanors, preliminary hearings in felony cases, and small civil matters. Circuit Courts, organized into 45 judicial circuits, have general jurisdiction over all felony trials and serious matters. The Missouri Court of Appeals, divided into three districts (Eastern, Western, and Southern), hears criminal appeals. The Missouri Supreme Court has exclusive jurisdiction over death penalty appeals and discretionary review over other cases. Grand jury indictment is not required for felony prosecution; Missouri primarily uses the information and preliminary hearing process.
Damages & Penalties
Missouri uses a five-class felony system. Class A felonies carry 10-30 years or life in prison. Class B felonies carry 5-15 years. Class C felonies carry 3-10 years and up to a $10,000 fine. Class D felonies carry up to 7 years and up to a $10,000 fine. Class E felonies carry up to 4 years and up to a $10,000 fine. Misdemeanors are classified as Class A (up to 1 year, $2,000 fine), B (up to 6 months, $500 fine), C (up to 15 days, $750 fine), and D (fine only, up to $500). First-degree murder is a separate category punishable by death or life without parole. Extended terms apply to persistent and dangerous felony offenders. Drug penalties vary by substance and amount, with trafficking offenses carrying enhanced mandatory minimums.
Recent Legislative Changes
Amendment 3, passed in November 2022, legalized recreational marijuana and included automatic expungement provisions for prior marijuana offenses. Missouri's expungement law was expanded in 2018 and again in 2021 (SB 588) to cover many more offenses and to reduce waiting periods. The 2021 changes made most misdemeanors eligible after 3 years and most felonies eligible after 7 years, with exceptions for violent and sexual offenses. Missouri also eliminated the statute of limitations for rape and sodomy in first-degree cases in 2020. The state continues to carry out executions, with several scheduled in recent years.
Key Takeaways
- Missouri uses a lifetime lookback for DWI and classifies repeat offenders as prior, persistent, or chronic, with felony charges starting at two prior offenses.
- Recreational marijuana is legal for adults 21+ following the 2022 passage of Amendment 3, with home cultivation of up to 6 flowering plants permitted.
- Missouri is a stand your ground state with no duty to retreat anywhere a person is lawfully present.
- The death penalty is authorized for first-degree murder, and Missouri is one of the more active states in carrying out executions.
- Felonies are classified into five classes (A through E) with corresponding sentence ranges from up to 4 years to life in prison.
- Expungement eligibility was dramatically expanded in 2021 to cover most offenses after 3-year (misdemeanor) or 7-year (felony) waiting periods.
Frequently Asked Questions
What are the DWI penalties in Missouri?
A first DWI is a Class B misdemeanor with up to 6 months in jail and a $500 fine. A second offense (prior offender) is a Class A misdemeanor with up to 1 year. A third offense (persistent offender) is a Class E felony with up to 4 years in prison. A fourth or subsequent offense (chronic offender) is a Class B felony with 5-15 years. Missouri uses a lifetime lookback for all prior offenses.
Can I grow marijuana at home in Missouri?
Yes. Adults 21 and older may cultivate up to 6 flowering plants, 6 nonflowering plants, and 6 clones at home. Plants must be grown in an enclosed, locked area not accessible to anyone under 21. Medical marijuana patients who cultivate at home are permitted the same limits. Local jurisdictions cannot prohibit home cultivation by individuals.
Is Missouri a stand your ground state?
Yes. Under Mo. Rev. Stat. § 563.031, as amended in 2016, a person has no duty to retreat before using force, including deadly force, in any place where they have a lawful right to be, if they reasonably believe such force is necessary to defend against death, serious physical injury, or a forcible felony. The castle doctrine provides additional protections inside the home and occupied vehicles.
How does expungement work in Missouri?
Missouri expanded its expungement statute significantly in 2021. Most misdemeanors are eligible for expungement after 3 years and most felonies after 7 years from completion of the sentence. Excluded offenses include Class A violent felonies, sex offenses requiring registration, domestic assault, and DWI (though first-offense DWI may be eligible). You may petition the court that entered the conviction, and the court weighs rehabilitation against public interest.
Does Missouri have the death penalty?
Yes. Missouri authorizes the death penalty for first-degree murder with aggravating circumstances. The method of execution is lethal injection. A jury must unanimously find at least one statutory aggravating factor to impose death. If the jury does not unanimously agree on death, the sentence is life without parole. Missouri has been one of the more active states in carrying out executions in recent years.
What are the marijuana laws for people under 21 in Missouri?
Individuals under 21 cannot legally possess recreational marijuana. Possession by a person under 21 is subject to civil penalties for small amounts. Minors caught with marijuana may face juvenile court proceedings. Medical marijuana is available to patients under 21 with a qualifying condition and a physician certification, with a parent or guardian serving as a registered caregiver.
This guide is provided for general informational purposes only and does not constitute legal advice. Missouri laws may change, and the information here may not apply to your specific situation. For advice tailored to your circumstances, consult with a qualified Missouri attorney.