Missouri Cannabis Laws

Missouri Cannabis Laws: History, Legalization, and Current Rules

Updated October 11, 2026.

Missouri permits medical cannabis and adult-use cannabis under Article XIV of its state constitution. Voters approved medical legalization in 2018 and adult-use legalization in 2022. Recreational retail sales began in February 2023.

Adults 21 and older may possess three ounces of cannabis or its equivalent and purchase from licensed dispensaries. Home cultivation requires separate state authorization. Recent developments include a 2025 ruling on local cannabis taxes and 2026 changes governing hemp-derived cannabinoids and consumer privacy.

Missouri Cannabis Laws at a Glance

Sources include the state’s adult-use FAQs, patient and consumer fact sheet, and Department of Revenue marijuana tax guidance.

How Missouri Cannabis Laws Changed Over Time

2014: Limited Hemp Extract Access

House Bill 2238 created a limited hemp-extract framework for treating intractable epilepsy. It authorized registration and regulated production of qualifying cannabidiol oil.

This narrow program preceded broader medical marijuana legalization. It did not establish recreational cannabis sales or general patient access to marijuana flower. The Department of Agriculture’s 2014 announcement explains the original production rules.

2018: Voters Approved Medical Marijuana

On November 6, 2018, voters approved Amendment 2, establishing a constitutional medical marijuana program. It took effect on December 6, 2018.

The amendment authorized qualifying patients, caregivers, personal medical cultivation, and licensed businesses. It also dedicated medical-program revenue, after operating expenses, to veterans’ health and care services. The original measure became Article XIV, Section 1 of the Missouri Constitution.

See the original constitutional provision and DHSS revenue overview.

2020: Medical Retail Sales Began

Medical retail access followed licensing, cultivation, testing, and facility preparation. Missouri’s first medical sales occurred in October 2020, almost two years after voters approved the program.

That distinction matters: the constitutional authorization preceded the availability of regulated dispensary products. DHSS documents implementation in its program history.

2022: Amendment 3 Legalized Adult Use

Voters approved Amendment 3 on November 8, 2022. It took effect on December 8, 2022, authorizing specified cannabis activities for adults 21 and older.

The amendment also changed the medical program. It increased the standard medical purchasing allowance to six ounces in 30 days, allowed nurse practitioners to certify qualifying conditions, and extended medical identification-card validity from one year to three years.

Adult-use legalization retained the medical system and added constitutional provisions for criminal-record expungement and microbusiness licensing. The state’s general FAQs explain the implementation timeline.

2023: Recreational Retail Sales Opened

On February 3, 2023, DHSS began approving medical facilities to convert to comprehensive licenses serving both patients and adult consumers. Adult-use sales began that day.

Personal possession had already become lawful in December 2022. Commercial sales required licensed facilities and operating rules. DHSS announced the launch in its February 2023 release.

2025: The Supreme Court Rejected Cannabis Tax Stacking

On July 22, 2025, the Missouri Supreme Court ruled that counties could not impose the additional local adult-use marijuana tax on sales inside incorporated municipalities under the constitutional definition of local government.

For this specific cannabis tax, the relevant local government is the city, town, or village in an incorporated area and the county in an unincorporated area. This ruling does not eliminate ordinary state or local sales taxes. See Robust Missouri Dispensary 3 v. St. Louis County.

2026: Hemp and Privacy Changes

House Bill 2641 introduced changes involving intoxicating hemp-derived products, consumer information, and patient privacy. DHSS issued implementation guidance on September 28, 2026.

The law restricts dispensaries from keeping identifying information about adult consumers without their affirmative agreement. It also restricts disclosure of medical patient information by state agencies to the federal government absent a subpoena or court order.

Its hemp provisions include phased implementation and a temporary beverage exception, described below. The DHSS guidance explains the current position.

Adult Possession, Purchases, and Sharing

An adult consumer may possess three ounces of dried cannabis or its equivalent and purchase up to that amount in one transaction. Concentrates and infused products count through equivalency calculations; each form does not create an independent three-ounce allowance.

Adults can transfer lawful quantities to another adult without payment. That permission does not authorize unlicensed commercial sales. Buying at multiple stores does not expand the amount a person may lawfully possess.

A medical card is unnecessary for an adult-use purchase, but accepted identification showing the purchaser is at least 21 is required. The state’s patient and consumer FAQs describe the limits.

Home Cultivation Requires a Card

Missouri differs from states that allow adults to grow automatically. A consumer must obtain a personal cultivation identification card before growing.

An authorized consumer may cultivate six flowering plants, six nonflowering plants over 14 inches tall, and six smaller nonflowering plants, for a total of 18. Plants must be secured in an enclosed, locked facility and shielded from ordinary public view.

The constitutional consumer limit at a residence is no more than twice the individual plant allowance. Having additional residents does not create unlimited cultivation capacity. Homegrown cannabis above the ordinary three-ounce possession allowance must remain secured at the authorized residence.

Personal cultivation authorization does not permit selling the harvest. DHSS explains the rules in its cultivation guidance.

Medical Cannabis Eligibility and Limits

Missouri’s medical program covers cancer, epilepsy, glaucoma, certain severe pain and muscle-spasm conditions, qualifying psychiatric disorders, terminal illness, and other conditions supported by professional medical judgment. The eligibility framework also addresses conditions normally treated with potentially dependency-forming prescription medicines.

Patients need practitioner certification and state registration. Patients under 18 require guardian consent and supervision. The official condition list explains eligibility.

The standard purchasing allowance is six ounces or equivalent in 30 days. A physician or nurse practitioner may certify a greater amount. Ordinary patient possession is limited to a 60-day supply, typically 12 ounces.

Patients cultivating, or receiving caregiver-grown cannabis, may possess a 90-day supply, provided the amount exceeding the 60-day supply stays in an approved enclosed, locked facility. Medical cultivation and caregiver rules have separate requirements. See the cultivation fact sheet.

Cannabis Taxes

Adult-use purchases carry a 6% state marijuana tax. Medical purchases carry a 4% state marijuana tax. These taxes apply in addition to ordinary sales taxes.

Voter-approved local adult-use marijuana taxes may add up to 3%, subject to the constitutional local-government definition and the 2025 Supreme Court ruling. The total checkout rate therefore depends on the dispensary’s location and applicable general sales taxes.

Neither “6% recreational tax” nor “4% medical tax” describes the complete tax bill by itself. Consult the Department of Revenue’s cannabis guidance and current tax-rate tables.

Public Consumption, Driving, and Visitors

Public consumption is generally prohibited. Smoking in a public place outside a specifically licensed or permitted area can lead to a civil penalty up to $100. Consumption at licensed dispensaries is prohibited.

Driving while impaired remains illegal. Legal possession does not authorize using cannabis while operating a vehicle or permit impairment at work. Property owners, accommodation providers, and employers may have applicable policies.

Out-of-state adults may purchase through the adult-use system at 21 or older. Missouri’s recognition of certain out-of-state medical authorizations for possession should not be confused with automatic eligibility for Missouri medical retail purchases.

State authorization does not permit carrying marijuana across state or international borders. The consumer fact sheet summarizes key restrictions.

Hemp-Derived Cannabinoids in 2026

DHSS’s September 2026 guidance explains that intoxicating hemp-derived cannabinoid products are brought into the marijuana framework, subject to a limited exception tied to federal implementation dates. Unlicensed sales or distribution of products classified as marijuana can lead to enforcement.

As of this article’s update, qualifying beverages containing naturally occurring cannabinoids that were not synthesized or manufactured outside the plant remain outside Article XIV authority until December 11, 2026, provided they are not sold to people under 21.

This is a limited exception, rather than general permission for all hemp intoxicants. Consult the current HB2641 guidance for implementation details.

Penalties and Expungement

Missouri retains penalties for possession and cultivation outside constitutional protections. Subject to applicable limitations, violations involving no more than twice the authorized amount can carry a civil penalty up to $250 for a first violation, up to $500 for a second, and misdemeanor treatment with a fine up to $1,000 for subsequent violations, plus forfeiture.

Amendment 3 also established expungement for eligible marijuana offenses and relief procedures for certain people still serving sentences. Exclusions include offenses involving violence, distribution to minors, and marijuana-impaired driving.

Eligibility depends on the record and applicable constitutional provisions. The controlling text is Article XIV, Section 2; an individual should confirm relief with the court that handled the case.

This article provides general legal information. Consult current Missouri law and agency guidance for a specific purchase, cultivation arrangement, tax question, or court record.