Missouri Medical Marijuana Laws and Regulations
Missouri Cannabis Laws: Complete Legal Guide 2026
Missouri became one of 24 states to legalize recreational cannabis when voters approved Constitutional Amendment 3 on November 8, 2022. Adult-use sales began February 3, 2023. The state's medical cannabis program has been operational since 2018 under Amendment 2.
Key Legislation
| Law | Citation | Effective Date |
|---|---|---|
| Amendment 2 (Medical) | Article XIV, Missouri Constitution | November 2018 |
| Constitutional Amendment 3 (Adult-Use) | Article XIV, Sections 1-8, Missouri Constitution | December 8, 2022 |
| Division of Cannabis Regulation Rules | 19 CSR 100 | Ongoing |
Division of Cannabis Regulation (DCR)
The Division of Cannabis Regulation (DCR) under the Missouri Department of Health and Senior Services (DHSS) oversees all cannabis licensing and regulation.
Contact Information:
- Website: health.mo.gov/safety/cannabis
- Phone: (866) 219-0165
- Email: medicalmarijuana@health.mo.gov
- Patient Portal: Missouri Medical Marijuana Registry
Adult-Use Cannabis (Amendment 3)
Under Constitutional Amendment 3, adults 21 and older may:
Possession Limits:
- 3 ounces of dried cannabis (or equivalent)
- 24 grams of cannabis concentrate
- Up to 6 flowering marijuana plants for personal home cultivation
- 6 non-flowering plants (over 14 inches) and 6 clones (under 14 inches)
Home Cultivation:
- Up to 6 flowering plants per person (max 12 per household if 2+ adults)
- Plants must be in an enclosed, locked facility
- Not visible from public areas without aids
- $100 cultivation license required for home grow
- Cannot use volatile solvents for extraction
Prohibited Activities:
- Public consumption of cannabis
- Consumption while operating a motor vehicle
- Providing cannabis to persons under 21
- Possession on school grounds or federal property
- Consumption in the workplace (unless permitted by employer)
- Exceeding possession limits
Medical Cannabis Program (Amendment 2)
Missouri's medical cannabis program operates under Article XIV of the Missouri Constitution, established through Amendment 2 in 2018.
Qualifying Medical Conditions:
- Cancer
- Epilepsy
- Glaucoma
- Intractable migraines and other chronic, severe headaches
- Chronic medical conditions causing severe, persistent pain
- Conditions causing persistent muscle spasms (including MS)
- Debilitating psychiatric disorders (including PTSD, if diagnosed by a physician)
- HIV/AIDS
- Hepatitis C
- Amyotrophic lateral sclerosis (ALS)
- Inflammatory bowel disease (IBD)
- Crohn's disease
- Huntington's disease
- Autism
- Neuropathies
- Sickle cell anemia
- Agitation of Alzheimer's disease
- Cachexia/wasting syndrome
- Terminal illness certified by a physician
- Any chronic, debilitating, or other medical condition that a physician recommends for treatment
Medical Patient Benefits:
- Higher possession limits (up to 4 ounces per 30 days)
- Tax exemption from the 6% cannabis sales tax
- Priority patient access at dispensaries
- Home cultivation with $100 cultivation card
Taxation
Adult-Use Cannabis:
- 6% state cannabis sales tax
- Standard 4.225% state sales tax also applies
- Local sales taxes may apply
- Total tax: approximately 10-15% depending on jurisdiction
Medical Cannabis:
- Exempt from the 6% cannabis sales tax
- Still subject to standard state/local sales tax
Penalties for Violations
Amendment 3 significantly reformed Missouri's cannabis penalties:
Decriminalization (Adults 21+):
| Violation | Classification | Penalty |
|---|---|---|
| > 3 oz personal use | Civil violation | Fine only |
| Public consumption | Civil violation | Fine up to $250 |
| Smoking in vehicle (driver) | Civil violation | Fine |
Criminal Penalties: Under Missouri Revised Statutes §579.015:
| Offense | Classification | Penalty |
|---|---|---|
| Possession > 10g (no card, under 21) | Class D Misdemeanor | Up to $500 fine |
| Possession 10-35g (no card, under 21) | Class A Misdemeanor | Up to 1 year, $2,000 fine |
| Distribution without license | Class C Felony | Up to 7 years, $10,000 fine |
| Distribution to minor | Enhanced Felony | Up to 15 years |
| Distribution near school | Enhanced penalties | Additional 2-15 years |
Note: Amendment 3 also provides for automatic expungement of certain past cannabis convictions.
Driving Under the Influence
Driving under the influence of cannabis is prohibited under Missouri Revised Statutes §577.010. Missouri has a behavioral impairment standard rather than a per se THC limit.
DUI Penalties:
- 1st offense: Class B misdemeanor, up to 6 months jail, $1,000 fine
- 2nd offense: Class A misdemeanor, up to 1 year jail, $2,000 fine
- 3rd offense: Class D felony, up to 7 years in prison
Medical patients are NOT exempt from DUI laws. Using a medical card is NOT a defense if impaired while driving.
Employment Rights
Amendment 3 includes some employee protections:
- Employers cannot discriminate against registered patients solely for having a medical card
- Employers may prohibit cannabis use/impairment during work hours
- Employers may maintain drug-free workplace policies for safety-sensitive positions
- Employers may take action if an employee is impaired at work
- Federal contractors and safety-sensitive positions may have different requirements
Local Regulations
Under Amendment 3, local jurisdictions may:
- Limit the number of cannabis establishments (cannot impose lower cap than Amendment 3 allows)
- Establish zoning requirements and buffer zones
- Require local licenses in addition to state licenses
- NOT ban the possession or personal use of cannabis by adults
- NOT prohibit licensed dispensaries from operating
- Allow or prohibit on-premises consumption establishments
Social Equity Provisions
Amendment 3 created one of the most comprehensive social equity programs:
- Microbusiness licenses reserved for equity applicants
- Priority licensing for individuals from disproportionately affected communities
- Automatic expungement of certain cannabis convictions
- Community reinvestment fund from cannabis tax revenue
- Lottery system for new licenses with equity priorities
Key Resources
- Division of Cannabis Regulation: health.mo.gov/safety/cannabis
- Patient Services: Patient Registration Portal
- Facility Licensing: Facility Information
- Licensed Dispensaries: Find a Dispensary
- Missouri Constitution Article XIV: revisor.mo.gov
- FAQs: Cannabis FAQ
Timeline of Legalization
| Date | Event |
|---|---|
| November 6, 2018 | Amendment 2 approved (medical cannabis) |
| 2020 | First medical dispensary sales |
| November 8, 2022 | Amendment 3 approved (adult-use cannabis) |
| December 8, 2022 | Personal possession and home cultivation become legal |
| February 3, 2023 | Adult-use sales begin at licensed dispensaries |
| Ongoing | Microbusiness licensing and social equity programs expand |
This information reflects Missouri cannabis laws as of December 2025. Always consult official state sources and legal counsel for the most current requirements.