Quick answer
Marijuana in Missouri: Recreational + medical legal. Missouri voters approved adult-use marijuana in 2022, with retail sales beginning in 2023. Adults 21 and older may possess up to three ounces and grow up to six plants (three mature) at home. State law provides some off-duty employment protections while preserving testing in safety-sensitive roles.
Key facts
- Recreational marijuana legal since 2022.
- Medical marijuana legal since 2018.
- Adults may typically possess up to 3 oz.
- Home cultivation permitted.
Workplace testing
Missouri restricts adverse employment action based solely on off-duty cannabis use, but employers can still test and act for safety-sensitive positions or when impairment is shown. A medical card does not provide blanket protection from testing.
Missouri law protects employees from adverse action based solely on off-duty cannabis use, but employers may still restrict use in safety-sensitive roles and enforce workplace policies.
Detection & panels
See how long substances stay detectable in our detection chart, compare standard panels, or use the test finder. Local testing locations in Missouri are listed on the Missouri drug testing page.
Frequently asked questions
Is marijuana legal in Missouri?
Missouri status: Recreational + medical legal. Missouri voters approved adult-use marijuana in 2022, with retail sales beginning in 2023. Adults 21 and older may possess up to three ounces and grow up to six plants (three mature) at home. State law provides some off-duty employment protections while preserving testing in safety-sensitive roles.
Can an employer in Missouri drug test me?
Missouri restricts adverse employment action based solely on off-duty cannabis use, but employers can still test and act for safety-sensitive positions or when impairment is shown. A medical card does not provide blanket protection from testing.
Does a medical card protect me from testing in Missouri?
Missouri law protects employees from adverse action based solely on off-duty cannabis use, but employers may still restrict use in safety-sensitive roles and enforce workplace policies.