California's medical cannabis rules come from three decades of ballot measures and legislation. Here is how they fit together, what limits apply to patients, and where federal law stands as of October 2026.
California was the first state to legalize medical marijuana, and its laws have been layered on top of each other ever since. Proposition 215 created the right to use cannabis with a physician's recommendation, SB 420 added the state ID card and possession limits, MAUCRSA built the licensed market, and Proposition 64 legalized adult use while keeping medical protections in place. This overview explains each law, the practical rules for possession, cultivation, work, driving, public use, and housing, and the current federal picture. It is general information, not legal advice.
Each major law added a piece rather than replacing what came before:
The Compassionate Use Act, Health and Safety Code 11362.5. Approved by voters on November 5, 1996, it lets patients and their primary caregivers possess and cultivate cannabis for personal medical use with a physician's recommendation, and protects physicians who recommend it. See /prop-215-california-law/.
The Medical Marijuana Program Act, Health and Safety Code 11362.7 and following. It created the voluntary county-issued Medical Marijuana Identification Card (MMIC), defined serious medical conditions and primary caregivers, and set baseline possession and plant limits.
The Medicinal and Adult-Use Cannabis Regulation and Safety Act (SB 94) merged the 2015 medical licensing laws with Prop 64 into one licensing system, now run by the Department of Cannabis Control. The old nonprofit collective model ended in January 2019.
The Adult Use of Marijuana Act legalized possession and home grow for adults 21 and older, created the licensed retail market, and expressly left the Compassionate Use Act intact.
Patients have higher limits than adult-use consumers. Under section 11362.77, a qualified patient or primary caregiver may possess up to 8 ounces of dried cannabis per patient and maintain up to 6 mature or 12 immature plants per patient. A patient may possess more if a physician recommends a larger amount to meet the patient's needs, and cities and counties may adopt higher local limits. Only dried mature female flowers count toward the weight limit.
For comparison, adults 21 and older without a recommendation may possess up to 28.5 grams of non-concentrated cannabis and up to 8 grams of concentrate, and may grow up to 6 living plants per residence (sections 11362.1 and 11362.2). Home grows must be in a locked space not visible from public places, and local governments may restrict outdoor cultivation. Making concentrates with volatile solvents such as butane requires a state license.
The California Supreme Court held in People v. Kelly (2010) that the SB 420 limits cannot cap the Compassionate Use Act defense. They work as a safe harbor: MMIC holders within the limits are protected from arrest, while other qualified patients may still defend amounts reasonably related to their medical needs.
Employers are not required to allow cannabis use or impairment at work (sections 11362.45 and 11362.785). Since January 1, 2024, however, Government Code 12954 (AB 2188) generally bars employers from penalizing workers or applicants for off-duty, off-site cannabis use or for drug tests that detect only non-psychoactive cannabis metabolites, and SB 700 bars most employers from asking applicants about past cannabis use. Exceptions include building and construction trades and jobs that require a federal background check or security clearance.
Driving under the influence of cannabis is illegal (Vehicle Code 23152(f)), medical status or not. You may not smoke or ingest cannabis while driving or riding as a passenger, and an open container or package is not allowed in the passenger area; keep it sealed or in the trunk.
Public consumption is prohibited except at licensed consumption sites. You may not smoke where tobacco smoking is banned, within 1,000 feet of a school, day care, or youth center while children are present (with a limited exception for private residences), or on those grounds at all while children are present.
Landlords and other private property owners may prohibit or restrict cannabis use and cultivation on their property (section 11362.45(h)), so check your lease. Federally assisted housing follows federal rules and may deny or end tenancy for cannabis use regardless of state law.
The Medicinal Cannabis Patients' Right of Access Act (SB 1186) has, since January 1, 2024, generally prevented cities and counties from banning delivery of medicinal cannabis to patients. Under Ryan's Law (SB 311, 2021), certain health care facilities must allow terminally ill patients to use non-smoked medicinal cannabis.
Patients with an MMIC do not pay state and local sales and use tax on qualifying medicinal purchases. The state cannabis excise tax still applies; it was set back to 15 percent on October 1, 2025 by AB 564.
In April 2026 the U.S. Department of Justice issued a final order placing two categories of marijuana in Schedule III of the Controlled Substances Act, effective immediately: FDA-approved drug products, and marijuana covered by a qualifying state license to manufacture, distribute, or dispense it for medical purposes. All other marijuana, including adult-use cannabis, remains in Schedule I. Several petitions challenging the order are consolidated in the U.S. Court of Appeals for the D.C. Circuit, which denied a request to put the order on hold on September 9, 2026; the case is ongoing.
A separate DEA proceeding on moving all marijuana to Schedule III held an administrative hearing from June 29 to July 15, 2026. On September 29, 2026, the presiding judge paused the proceeding to consider a new Government Accountability Office report. No final rule on broader rescheduling had been issued as of mid-October 2026.
Even with these changes, cannabis may not be taken across state lines or possessed on federal land such as national parks. On June 18, 2026, the U.S. Supreme Court ruled in United States v. Hemani that the federal ban on gun possession by unlawful drug users was unconstitutional as applied to the defendant, a regular marijuana user, without striking the law down entirely. See /gun-ownership/ for what this means for patients.
Last reviewed: October 13, 2026. This page is general information, not legal or medical advice.
For many patients, yes. A recommendation allows purchases at 18, higher possession and plant limits, and, with an MMIC, an exemption from sales and use tax. See /medical-vs-recreational/ for a comparison.
Up to 8 ounces of dried cannabis and 6 mature or 12 immature plants per patient under section 11362.77, or more if a physician recommends it or local rules allow it.
Employers can prohibit use or impairment on the job. Since 2024, most California employers cannot penalize off-duty, off-site use or rely on tests that show only non-psychoactive metabolites, with exceptions for construction trades and federal-clearance jobs.
Yes. State law lets private property owners prohibit or restrict cannabis use and cultivation on their property, and federally assisted housing follows federal law.
Not generally. Since April 2026, marijuana under a qualifying state medical license and FDA-approved products are in Schedule III, but that order is being challenged in court and all other marijuana remains Schedule I.
No. Crossing state lines with cannabis remains illegal under federal law. See /reciprocity/ for how other states treat California patients.
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