Michigan’s Delta-9 THC laws let adults 21 and older possess, buy, and use marijuana-derived Delta-9 within set limits under the Michigan Regulation and Taxation of Marihuana Act, and until now have also allowed hemp-derived Delta-9 products that stay under the federal 0.3% threshold. A federal law signed on November 12, 2025 will tighten the hemp side dramatically starting November 12, 2026, so the rules you follow in 2026 and after depend heavily on whether the THC in your product came from marijuana or from hemp.
What Adults 21 and Older Can Possess, Buy, and Grow
If you’re 21 or older, you can carry up to 2.5 ounces of marijuana outside your home, with no more than 15 grams of that total in concentrate form such as vape cartridges, wax, or shatter. At home the ceiling is higher: up to 10 ounces, plus whatever your own plants produce, as long as anything over 2.5 ounces is kept in a locked container or secured area. You can also grow up to 12 plants at your residence for personal use.1Michigan Legislature. Michigan Compiled Laws MCL 333.27955
At a licensed dispensary, the single-transaction limit matches the possession limit: 2.5 ounces per purchase, 15 grams of that in concentrate. State law doesn’t cap how many transactions you can make in a day, though individual retailers sometimes set their own policies. Michigan applies a 24% wholesale tax on adult-use marijuana, and that tax is already baked into the shelf price.2State of Michigan. Wholesale Marijuana Tax
Where You Can and Can’t Use It
Public use is illegal. That covers smoking, vaping, and eating marijuana edibles in parks, on sidewalks, at restaurants, at event venues, and anywhere else the general public is invited. Using marijuana inside a vehicle is also illegal, whether the vehicle is moving or parked.3Michigan Legislature. Michigan Compiled Laws MCL 333.27954
Legal consumption happens on private property. Your own home is the clearest example, and Michigan has also licensed cannabis consumption lounges and temporary cannabis events. If you rent, read your lease: landlords can prohibit marijuana use in rental units, and that prohibition is enforceable. Federal property inside Michigan — military bases, national parks, federal buildings and courthouses — follows federal law, under which marijuana is still entirely illegal.
Driving After Using THC
Michigan’s driving rule is the trap most people miss. There is no minimum blood concentration for a THC-related driving offense. Under MCL 257.625, operating a vehicle with any detectable amount of a Schedule 1 controlled substance in your body is illegal, and THC qualifies.4Michigan Legislature. Michigan Compiled Laws MCL 257.625
Because THC can stay detectable in blood for days or weeks after use, you can be charged even if you last used marijuana well before getting behind the wheel and feel completely sober. The prosecution does not have to prove you were actually impaired. Presence is enough. A first operating-under-the-influence offense carries up to 93 days in jail, a fine up to $500, license suspension, and possible vehicle immobilization, and repeat offenses escalate sharply. The source of the THC doesn’t matter: dispensary flower, a home-grown plant, and a hemp gummy from a gas station all count the same.
Penalties for Going Over the Limits
Possession above the legal amounts is handled on a tiered scale, with most violations treated as civil infractions rather than crimes.
- Possession slightly over the limit by someone 21 or older: civil infraction, fine up to $100, and forfeiture of the marijuana.
- Up to double the allowed amount, first offense: civil infraction, fine up to $500.
- Up to double, second offense: civil infraction, fine up to $1,000.
- Up to double, third or subsequent offense: misdemeanor, fine up to $2,000.
- More than double the allowed amount: misdemeanor, with no jail time unless the violation was habitual, willful, and for a commercial purpose, or involved violence.5Michigan Legislature. Michigan Compiled Laws MCL 333.27965
Anyone under 21 who possesses marijuana faces the same civil infraction structure (fines starting at up to $100 for a first offense), with the added possibility of community service and mandatory drug education. Selling marijuana without a license is a separate and much more serious offense that can rise to a felony depending on quantity.
Hemp-Derived Delta-9 THC Right Now
The 2018 Farm Bill defined “hemp” as cannabis containing no more than 0.3% Delta-9 THC on a dry weight basis and removed it from the Controlled Substances Act.6U.S. Department of Agriculture. Hemp Because the limit is a concentration rather than a total milligram amount, a large enough product — a heavy gummy, a full bottle of beverage — can carry a meaningful dose of Delta-9 while still qualifying as hemp. That is why hemp-derived Delta-9 gummies, drinks, and tinctures have been sold legally at Michigan convenience stores, smoke shops, and online, outside the dispensary system. Michigan’s hemp statutes were built around this same 0.3% Delta-9 line.
The November 12, 2026 Federal Hemp Change
On November 12, 2025, President Trump signed the FY2026 Agriculture appropriations act (P.L. 119-37), which rewrites the federal definition of hemp. The new definition takes effect November 12, 2026.7Congress.gov. Changes to the Federal Definition of Hemp – Legal Considerations Under the Controlled Substances Act Three changes drive the shift:
- The 0.3% threshold shifts from Delta-9 THC alone to total THC, which includes Delta-8, Delta-10, THCA, and other THC variants. Products that qualified only because their Delta-9 was low while other isomers were high will no longer be hemp.
- Finished hemp-derived cannabinoid products cannot contain more than 0.4 milligrams of combined total THC per container. A typical hemp Delta-9 gummy on shelves today carries 5 to 25 milligrams, so those products will be federally illegal once the new rule takes hold.
- Cannabinoids synthesized or manufactured outside the cannabis plant no longer qualify as hemp, even if the same compound occurs naturally in the plant. This directly targets lab-converted Delta-8 THC, which is generally made from CBD.
The practical result is that most consumable hemp-derived THC products currently sold outside dispensaries will become federally illegal marijuana or controlled THC after November 12, 2026.8Office of the Law Revision Counsel. 7 USC 1639o – Definitions Industrial hemp grown for fiber, grain, or seed is not affected; the new law explicitly keeps industrial hemp in the definition.
Michigan’s own hemp framework was written around the old Delta-9-only threshold, and the Michigan Senate Fiscal Agency has noted the state’s hemp program will no longer meet federal requirements without amendments.9Michigan Senate Fiscal Agency. Federal Hemp Program Changes Expect a period of uncertainty about which hemp-derived products remain legal under Michigan law even after the federal change takes effect. Marijuana-derived Delta-9 sold through licensed Michigan dispensaries is not affected by the federal hemp overhaul; it operates under MRTMA.
The Medical Program, Briefly
Michigan’s medical marijuana program predates recreational legalization and still runs alongside it. Patients with qualifying conditions — including cancer, glaucoma, PTSD, chronic pain, Crohn’s disease, Parkinson’s disease, and epilepsy-related seizures, among others — can register and buy from both medical and adult-use dispensaries.10Cannabis Regulatory Agency. What Medical Conditions Are Eligible Medical products may be exempt from certain taxes and are available in higher potencies than adult-use products. The medical route is also the only legal path for patients under 21, who access it with a caregiver.