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Is Cannabis Legal in Missouri?

Cannabis legalization in Missouri

The easy answer to those wondering if cannabis is legal in Missouri, is yes, for medicinal purposes

But there are rules every patient should know in order to comply with state laws. Below, you’ll find out what you need to know about Missouri’s medical marijuana laws as a patient, along with a brief history of medical marijuana in the United States, and the state of Missouri. 


States all around the country have been legalizing cannabis for medical and adult use since California became the first state to legalize medical use with the passing of the Compassionate Use Act in 1996. Cannabis is now legal for medicinal use in 36 states, including Missouri, and adult use is legal in 15 states. Missouri became the 31st state to legalize a medical marijuana program, when Missouri voters approved Amendment 2 in November of 2018. The state actually made another mark in history that year, being the first state in the country to see three separate legalization measures for voters to choose from on the 2018 ballot. 

Amendment 2 was backed by New Approach Missouri, and was clearly favored by patients and patient advocates who showed their support with an overwhelming amount of votes. When it was passed, it appointed the Missouri Department of Health and Senior Services (DHSS) as the state governmental agency in charge of Missouri’s medical marijuana program. Although Amendment 2 amended Missouri’s constitution, legalizing medical marijuana in November of 2018, the regulatory and retail processes have just officially started for patients with the opening of Missouri’s first dispensaries in October of 2020. Before this, patients in Missouri did not have access to purchase medical marijuana. It took this long to ensure the proper creation, inspection and approval of the regulatory process.

Cannabis Legal Missouri

Now that Missouri patients have access to purchase medical marijuana in dispensaries, here is what you need to know to keep it legal.

Patients are authorized to possess no more than a 60 day supply of marijuana at any given time, unless authorized for more by a qualifying physician. The state of Missouri defines a 60 day supply as four ounces of dried marijuana flower, or its equivalent. One ounce of dried, unprocessed marijuana is equivalent to eight grams of concentrate or 800 milligrams of THC in infused products.

When it comes to consuming medical marijuana in Missouri, patients are prohibited from consuming in public.

This can include any location open to the general public. You are allowed to transport your medical marijuana within the state, like in your vehicle, as long as it is within the limits of possession. Driving under the influence of medical marijuana however, is prohibited and having an approved patient identification card does not exempt you or protect you from any laws regarding the operation of motorized vehicles and machinery. 


These are the primary rules to keep in mind for purchasing and possessing medical marijuana as a patient in Missouri. Out of state residents who have an approved medical marijuana patient card from another state are not permitted to purchase medical marijuana in Missouri. Only Missouri residents, with approved medical marijuana cards, are allowed to purchase and possess medical marijuana in the state. 

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