Marijuana is legal in Detroit for adults 21 and older, both recreationally and medically. Michigan voters approved recreational cannabis in 2018 through the Michigan Regulation and Taxation of Marihuana Act, and the state’s medical program has run since 2008. You can possess up to 2.5 ounces in public, keep up to 10 ounces at home, buy from licensed dispensaries, and grow up to 12 plants per household. What legalization does not do is protect your job, your firearms, or your driver’s license, and Detroit adds its own rules on top of the state framework.
How Much You Can Carry and Keep
If you’re 21 or older, Michigan law lets you carry up to 2.5 ounces of marijuana outside your home, with no more than 15 grams of that in concentrate form. At home you can keep up to 10 ounces, but anything over 2.5 ounces has to be stored in a locked container or secured area.1Michigan Legislature. Michigan Code 333.27954 – Personal Use of Marihuana
Gifting is allowed within those same amounts. You can give another adult up to 2.5 ounces of flower or 15 grams of concentrate as long as no money changes hands. Selling without a license is illegal at any amount.
Edibles, liquids, and concentrates count toward the limit through state equivalency ratios, so a mix of products can add up faster than the flower weight suggests.
Medical Patients
Michigan’s Medical Marihuana Act, in effect since December 2008, covers patients with qualifying conditions who hold a state-issued registry card.2Michigan Legislature. Michigan Medical Marihuana Act Registered patients can possess up to 2.5 ounces at any given time.3Michigan Legislature. Michigan Code 333.26424 – Qualifying Patient or Primary Caregiver, Arrest, Prosecution, or Penalty Prohibited The Cannabis Regulatory Agency caps purchases at 2.5 ounces per day and 10 ounces per month.4Cannabis Regulatory Agency. Michigan Marihuana Rules – R 420.506 Purchasing Limits Patients must be at least 18 and need both a registry card and a government-issued ID at the dispensary. Medical purchases are also exempt from the recreational excise taxes.
Where You Can Use It
Consumption is limited to private property. You can use marijuana in your own home, but landlords have the legal right to prohibit it on their property, and most Detroit leases include that restriction. A landlord ban applies even inside your unit.1Michigan Legislature. Michigan Code 333.27954 – Personal Use of Marihuana
Public consumption is illegal. That covers sidewalks, parks, schools, and anywhere the general public can access. The one exception is a municipally licensed consumption area for adults 21 and older, which Detroit has authorized.
Federal property is off limits entirely. Marijuana remains a Schedule I controlled substance under federal law, and possession on federal land, including national parks, federal courthouses, post offices, and military installations, is a federal offense regardless of Michigan law.5Office of the Law Revision Counsel. United States Code Title 18 Section 922
Detroit’s Consumption Lounges
Detroit is one of the few Michigan cities that licenses consumption lounges, commercial venues where adults 21 and older can use marijuana on-site. The city caps these at 30 total: 15 standard and 15 equity licenses reserved for qualifying Detroit residents.6City of Detroit. Detroit City Code Chapter 20 Health Article VI – Medical Marijuana Facilities and Adult-Use Marijuana Establishments Lounges operate between 9:00 a.m. and 2:00 a.m. and cannot sell alcohol or tobacco. Regular dispensaries and retail shops do not permit on-site use.
Buying at a Detroit Dispensary
Recreational purchases require a government-issued photo ID showing you’re 21 or older. Medical patients bring their registry card plus a separate photo ID. Most dispensaries are cash-only because federal banking rules make traditional accounts difficult for cannabis businesses, though some have workarounds through credit unions or cashless payment apps.
Recreational sales carry a 10% state excise tax plus Michigan’s 6% sales tax. Michigan also imposes a 24% wholesale excise tax on the supply chain, which is baked into retail prices before the shelf tag.7Michigan Department of Treasury. Notice to Taxpayers Regarding the Wholesale Tax on Adult-Use Marihuana
Growing at Home
Adults 21 and older can grow up to 12 marijuana plants per household. That’s a per-household cap, not per-person: two adults living together still max out at 12 combined. Plants cannot be visible from any public area without optical aids, and they have to be in an enclosed space with a working lock.1Michigan Legislature. Michigan Code 333.27954 – Personal Use of Marihuana
You can keep the marijuana your 12 plants produce even if the total exceeds 10 ounces, as long as the excess stays in a locked container. Selling any of it requires a state and local commercial license. Home cultivation is strictly for personal use.
One safety rule to know: you cannot use butane or any solvent with a flashpoint below 100 degrees Fahrenheit to make concentrates in a residential area, a motor vehicle, or a public space.
Penalties for Going Over the Limits
Exceeding the possession limits doesn’t automatically mean jail, but the penalties escalate:
- Legal amount used in the wrong circumstances, such as public consumption: civil infraction, fine up to $100.
- Up to twice the legal amount, first offense: civil infraction, fine up to $500.
- Up to twice the legal amount, second offense: civil infraction, fine up to $1,000.
- Up to twice the legal amount, third or later offense: misdemeanor, fine up to $2,000.
- More than twice the legal amount: misdemeanor, with imprisonment reserved for violations that were habitual, commercial in purpose, or involved violence.
Forfeiture of the marijuana can accompany any of these.8Michigan Legislature. Michigan Code 333.27965 – Violations, Penalties Someone under 21 caught with up to 2.5 ounces faces a $100 fine for a first offense and $500 for a second, with drug education or counseling possible for minors under 18.
Driving After Using Marijuana
This is the sharpest legal risk for regular users in Detroit. Michigan treats driving with any amount of a Schedule I substance in your body as operating while intoxicated, the same charge as drunk driving. There is no THC equivalent to the 0.08 blood-alcohol threshold. Any detectable amount can support a charge.9Michigan Legislature. Michigan Code 257.625 – Operating While Intoxicated
Because THC can remain detectable in blood for days, someone who used the night before can still test positive the next morning. A first offense carries up to 93 days in jail, a fine between $100 and $500, and up to 360 hours of community service. A second offense within seven years carries at least five days of mandatory jail time and fines up to $1,000. A third or subsequent offense is a felony punishable by one to five years in state prison and fines up to $5,000.9Michigan Legislature. Michigan Code 257.625 – Operating While Intoxicated
Your Job Is Not Protected
Michigan’s law explicitly says the MRTMA does not require any employer to permit marijuana use in the workplace or on company property. Employers can maintain drug-free policies, test for marijuana, refuse to hire based on a positive test, and fire you for cannabis use off the clock, even with a medical card.1Michigan Legislature. Michigan Code 333.27954 – Personal Use of Marihuana
The statute creates no exception. If your company has a zero-tolerance policy, a positive THC test is grounds for termination regardless of when or where you used. Safety-sensitive roles, federal contractor positions, and jobs requiring a commercial driver’s license face even tighter consequences.
Marijuana and Firearms
Federal law prohibits anyone who uses a controlled substance, marijuana included and regardless of state legality, from purchasing or possessing firearms.5Office of the Law Revision Counsel. United States Code Title 18 Section 922 The ban covers possession, not just purchases: if you already own guns and start using marijuana, keeping those firearms is a federal felony.
ATF Form 4473, required for every purchase from a licensed dealer, asks directly about marijuana use. Answering yes disqualifies the sale. Answering no while using marijuana is a separate federal crime. The Supreme Court heard oral arguments in United States v. Hemani in March 2026, a case challenging the blanket federal ban on marijuana users possessing firearms, with a decision expected by summer 2026.