Medicinal marijuana is not legal in Wisconsin. The state has no medical cannabis program, no licensed dispensaries, and no mechanism for a physician to prescribe or recommend marijuana to a patient. Marijuana remains a Schedule I controlled substance under state law, and possessing it is a crime regardless of the medical reason. A narrow exception exists for non-psychoactive CBD with a physician’s certification, and pending legislation could change the picture, but as the law stands today a Wisconsin patient has no legal way to obtain or use medical marijuana within the state.
What Wisconsin Law Actually Says
Wisconsin’s Uniform Controlled Substances Act places tetrahydrocannabinols on Schedule I, the category reserved for substances the state treats as having high abuse potential and no accepted medical use.1Wisconsin State Legislature. 2013 Wisconsin Act 267 The classification covers THC in any form, whether from the plant or synthesized. Because of that classification, no physician in Wisconsin can lawfully prescribe or recommend marijuana, and no dispensary can lawfully operate.
That puts Wisconsin at odds with every state it borders. Illinois, Michigan, and Minnesota all permit cannabis sales through licensed dispensaries. The practical result for a Wisconsin patient is simple: a medical card issued in another state has no legal effect here, and marijuana purchased legally elsewhere becomes illegal the moment it enters Wisconsin.
The CBD Exception
Wisconsin carves out one narrow pathway for a cannabis-derived product. A person may legally possess cannabidiol “in a form without a psychoactive effect” if they hold a current physician’s certification stating the CBD is for a medical condition.2Wisconsin State Legislature. Wisconsin Statutes 961.32(2m)(b) The certification must list the physician’s name, address, and phone number along with the patient’s name and address, and it expires one year after issue.
The exception originated with 2013 Wisconsin Act 267, informally called “Lydia’s Law,” which first focused on CBD for seizure disorders.1Wisconsin State Legislature. 2013 Wisconsin Act 267 A 2017 amendment broadened access so any person with a physician’s certification could possess CBD for any medical condition.
The statute uses the phrase “without a psychoactive effect” rather than a specific THC percentage. Most CBD products that meet the federal 0.3% THC threshold for hemp will fall within the exception in practice, but the legal test in Wisconsin is the absence of psychoactive effect, which is a slightly different standard.
This exception does not cover marijuana flower, edibles with meaningful THC content, vape cartridges, or any other product capable of producing a high. For those, there is no medical exception at all.
Penalties If You Use Marijuana Without Legal Cover
A first possession offense is a misdemeanor carrying up to a $1,000 fine and up to six months in jail.3Wisconsin State Legislature. Wisconsin Statutes 961.41(3g)(e) There is no small-amount threshold that reduces the charge. A single joint and several ounces fall within the same statutory range.
A second or subsequent possession offense is a Class I felony, with a maximum $10,000 fine and up to three and a half years in prison. The jump from misdemeanor to felony applies regardless of how much marijuana is involved or how much time has passed between offenses.
Paraphernalia is charged separately. A pipe, grinder, or papers used with marijuana can add a misdemeanor with up to a $500 fine and 30 days in jail.4Wisconsin State Legislature. Wisconsin Statutes 961.573(1) Paraphernalia charges commonly accompany possession charges.
Why a Trip to Illinois or Michigan Isn’t a Workaround
The nearest legal dispensaries are a short drive from the Wisconsin border, and the temptation is obvious. Transporting marijuana across any state line is a federal offense regardless of whether both states have legalized it. Crossing back into Wisconsin with a legal Illinois or Michigan purchase turns a lawful transaction into both a federal crime and a Wisconsin state crime at the border.
Interstate highways near those borders are exactly where law enforcement looks for this activity. A routine traffic stop in Wisconsin can escalate fast, for a reason explained below.
Local Decriminalization Won’t Protect You
Dozens of Wisconsin cities and counties, including Madison and Milwaukee, have ordinances that treat small-scale possession as a civil violation with a modest fine instead of a criminal charge. In some jurisdictions the fine is as low as $1 for possession of 28 grams or less.
These ordinances do not override state law. A district attorney retains full authority to charge possession under the state criminal statute instead of or alongside the local ordinance. Whether that happens depends on the prosecutor, the circumstances of the stop, and the county. A local decriminalization ordinance is not a reliable shield, especially if the amount approaches the ordinance’s upper limit or other charges enter the picture.
The Smell of Marijuana Still Justifies a Search
One consequence of the odor rule catches people off guard. The Wisconsin Supreme Court has held that the smell of marijuana gives police probable cause to search a vehicle, even acknowledging that legal hemp products can produce an identical odor.5Justia. State v. Moore – Wisconsin Supreme Court Decisions The underlying rule traces to the 1999 decision in State v. Secrist, where the court found the “unmistakable” smell of marijuana could justify an arrest.
Even in a city where possession carries a $1 fine, the odor from a legal hemp product or a small amount of marijuana can trigger a full vehicle search. Anything else turned up during that search becomes fair game for prosecution.
Hemp-Derived Products Like Delta-8
The 2018 federal Farm Bill removed hemp and its derivatives from the Controlled Substances Act, defining hemp as cannabis containing no more than 0.3% delta-9 THC by dry weight. That opened the door to intoxicating cannabinoids like delta-8 THC, delta-10 THC, and THC-O produced from legal hemp. These products appear in Wisconsin gas stations, smoke shops, and online stores.
Wisconsin has not banned these products, but a 2025 bill would classify them as “intoxicating hemp products,” limit sales to buyers 21 and older, require independent lab testing with a certificate of analysis, and impose penalties from a $500 civil forfeiture for a first violation up to $10,000 and nine months in jail for repeat offenders.6Wisconsin State Legislature. Bill Text – Wisconsin Legislature SB644 Until that or a similar measure passes, delta-8 remains available for purchase, but the legal environment is unsettled and enforcement attitudes vary. Treating these products as a guaranteed safe substitute for medical marijuana would be a mistake.
Firearms and Any Marijuana Use
Federal law prohibits anyone who is an “unlawful user of” a controlled substance from possessing a firearm. Because marijuana remains illegal under both federal and Wisconsin law, any marijuana user in the state falls within that prohibition. A violation of 18 U.S.C. § 922(g)(3) is a federal felony with potential prison time and lasting consequences for employment, housing, and voting rights.
The restriction extends to purchasing firearms. The ATF’s Form 4473, which every buyer completes at a licensed dealer, asks whether the buyer is an unlawful user of any controlled substance. A false answer is a separate federal felony. In Wilson v. Lynch, the Ninth Circuit upheld the government’s authority to block firearm sales to a medical marijuana cardholder, finding that the restriction survived constitutional scrutiny.7Justia. Wilson v. Lynch If Wisconsin ever establishes a medical cannabis program, that federal conflict will not automatically resolve. Patients in states with legal medical marijuana face the same firearm bar, and no court has yet struck it down.
What Could Change
The most significant medical cannabis effort to date is Senate Bill 1045, a bicameral proposal from the 2025-2026 session backed by top Republican senators, which would establish a medical cannabis program and address expungement of past marijuana convictions.8Wisconsin State Legislature. 2025 Senate Bill 1045 Whether it can assemble enough votes to pass both chambers is an open question, but it has moved further in the legislative process than any prior attempt. Until a bill reaches the governor’s desk and becomes law, Wisconsin’s answer on medical marijuana remains no.