Missouri

Overview

Missouri legalized medical cannabis on November 6, 2018 via Amendment 2 (66% approval), with the first licensed sales beginning October 17, 2020. Adult-use cannabis was legalized on November 8, 2022 via Amendment 3 (53–47%), taking effect December 8, 2022, with first retail sales February 3, 2023.

Both programs are administered by the Missouri Department of Health and Senior Services Division of Cannabis Regulation. Both legalization mechanisms were constitutional amendments, providing the program with constitutional rather than statutory protection from legislative rollback.

Adult-use (Amendment 3, 2022)

• Public possession: up to 3 ounces of cannabis.
• Home cultivation: registered cultivators (with $100 annual registration fee) may grow 6 flowering plants, 6 nonflowering plants, and 6 clones at home.
• Tax: 6% state sales tax plus up to 3% local option.
• Revenue allocation: funds the expungement of non-violent cannabis convictions, veteran health care, substance-abuse treatment, and public defense.

Medical program (Amendment 2, 2018)

Qualifying conditions

Amendment 2 establishes a broad qualifying-condition framework. Physicians may recommend medical cannabis for "chronic, debilitating or other medical condition" including:

• Cancer, HIV/AIDS, ALS
• Multiple sclerosis
• Crohn's disease, inflammatory bowel disease
• Parkinson's disease, Alzheimer's disease
• Epilepsy and seizure disorders
• Chronic pain
• PTSD
• Terminal illness
• Plus any condition the physician determines would benefit from cannabis treatment

Patient access

• Possession: typically 4 oz per 30-day supply, with practitioner authority to certify higher amounts for clinical need.
• Approved forms: flower, edibles, oils, tinctures, capsules, vapes.
• Home cultivation: registered medical patients may grow up to 6 flowering plants.
• Reciprocity: Missouri does not formally recognize out-of-state medical cards; visiting patients aged 21+ may purchase from any adult-use retailer.
• Tax preference: medical sales taxed at 4%, vs. 6%+ for adult-use.

Patients and caregivers

• Patient minimum age: 18. Minor patients require a designated caregiver and physician certification.
• Caregiver minimum age: 21.
• Caregivers per patient: up to 2 designated caregivers per patient.
• Caregiver registration: via the Division of Cannabis Regulation; criminal background check.

Patient registration steps

1. Schedule a visit with a Missouri-licensed physician willing to recommend cannabis for a qualifying condition. The certifying physician must establish a bona fide patient-provider relationship and conduct an in-person evaluation. Telehealth follow-up is permitted under DHSS rules.
2. The physician submits a certification through the DHSS Division of Cannabis Regulation patient registry.
3. The patient applies through the registry portal, submits identity documents, proof of Missouri residency, and a current photo. The standard application fee is $25; cultivation registration adds $100 annually.
4. Approved patients receive a state-issued ID card valid for one year and renewable. The card authorizes purchases at any licensed Missouri dispensary under the medical tax preference and possession-cap framework.

Minor patients require a designated caregiver and a second physician's concurring certification. Caregivers complete a separate application and Missouri State Highway Patrol background check.

Reciprocity and visiting patients

Missouri's framework is dual-track for visitors:

• Adult-use: any visitor 21 or older with a government-issued photo ID may purchase from a licensed adult-use retailer under the 3 oz cap.
• Medical: Missouri does not formally recognize out-of-state medical cards. Visiting medical patients access cannabis through the adult-use retail framework if 21 or older.

The medical-program tax preference (4% state vs 6% plus local for adult-use) is meaningful for high-volume patients. Visiting medical patients cannot access this preference or the higher 4 oz / 30-day medical possession cap.

Employment and workplace

Missouri Constitution Article XIV provides explicit employment protections for registered medical-cannabis patients, with the standard carve-outs:

• Patient discrimination: employers may not discriminate against an employee solely based on patient registry status.
• Safety-sensitive positions: employers may continue to enforce drug-free workplace policies for safety-sensitive roles as defined by the employer.
• Federal contractor and DOT-regulated positions: federal drug-free workplace and DOT testing rules supersede state-level protection.
• Adult-use: Article XIV does not extend equivalent employment protections to adult-use consumers. Employers may discipline workers for off-duty adult-use cannabis use under most circumstances.
• Workers' compensation: post-incident testing positive for THC may result in benefit denial unless the patient documents medical use within certified parameters.

Public-employee positions, healthcare licensing, and CDL holders face additional licensing-board exposure beyond employer discipline.

Hemp-derived intoxicants

Missouri saw substantial retail expansion of hemp-derived intoxicating cannabinoids (delta-8 THC, delta-10 THC, THC-O, HHC) through gas-station, vape-shop, and dedicated hemp-retailer channels between 2021 and 2024. Governor Mike Parson issued Executive Order 24-10 in August 2024 directing state agencies to treat these products as controlled substances; litigation by hemp retailers obtained a preliminary injunction, leaving the regulatory status contested. The Missouri legislature has considered comprehensive hemp regulation in successive sessions without enactment.

Expungement

Amendment 3 included automatic expungement provisions for non-violent cannabis convictions. Implementation has been carried out by the Missouri Supreme Court Office of State Courts Administrator (OSCA). As of mid-2026, well over 100,000 records have been expunged or sealed, with ongoing work on more complex cases (including individuals with conviction histories that include both qualifying and disqualifying offenses).

Recent legislative and regulatory history

Notable post-2022 developments:

• 2022: Amendment 3 approved.
• 2023: licensed adult-use retail sales began February 3; first year of adult-use sales exceeded $1 billion.
• 2024: Governor Parson's hemp executive order; ongoing licensing-allocation litigation.
• 2025: Comprehensive Cannabis Regulation Act amendments adjusted micro-license framework, advertising rules, and laboratory testing requirements.
• 2026: continued legislative work on hemp regulation, social-equity license expansion, and on-premises consumption pilots.

The April 2026 federal Schedule III rescheduling order produced no immediate Missouri legislative response. DHSS issued operator guidance confirming that state-level licensing and compliance obligations are unchanged.

Federal context

Federal jurisdiction layers additional exposure on federal land, federal courthouses, military installations (Fort Leonard Wood, Whiteman Air Force Base, Lake City Army Ammunition Plant), and interstate highways. Mark Twain National Forest, Ozark National Scenic Riverways, and Gateway Arch National Park fall under federal cannabis prohibition regardless of state authorization. I-29, I-35, I-44, I-55, I-64, and I-70 corridors see active state-patrol and federal drug-interdiction activity, particularly at the Kansas, Iowa, Illinois, Kentucky, Tennessee, Arkansas, and Oklahoma borders.