SB 420: Provisions, Kelly Ruling, and Post-Prop 64 Status

California SB 420, formally the Medical Marijuana Program Act, is a 2003 state law that filled in the gaps left by Proposition 215 by setting possession and cultivation limits for medical marijuana patients, creating a voluntary state identification card, defining who qualifies as a primary caregiver, and authorizing collective and cooperative cultivation. Governor Gray Davis signed it in October 2003, and it took effect on January 1, 2004.¹ Much of the law has since been overtaken by court rulings and by California’s 2016 shift to a unified cannabis licensing system, but the identification card program it created is still running.

Why the Legislature Passed SB 420

Proposition 215, the 1996 Compassionate Use Act, made California the first state to legalize medical marijuana, but it did not say how much a patient could possess, created no registry, and gave no state agency authority to administer it.² Local rules filled the vacuum unevenly. Sonoma County allowed up to 99 plants and three pounds of dried marijuana; other jurisdictions had no guidelines at all.¹

The California Supreme Court’s 2002 decision in People v. Mower made the gaps harder to ignore. The court held that Proposition 215 gave patients only “limited immunity” — they could raise their status as a defense, but they still had to raise a reasonable doubt about the underlying facts, and the initiative did not shield them from arrest.³ Senator John Vasconcellos authored SB 420 to give patients, caregivers, and law enforcement a clearer statewide framework. The law was codified at Health and Safety Code sections 11362.7 through 11362.83.⁴

What SB 420 Established

Possession and Cultivation Limits

SB 420 set a statewide baseline: qualified patients or their caregivers could possess eight ounces of dried marijuana and grow no more than six mature or 12 immature plants. Only dried mature processed flowers counted toward the eight-ounce limit. Patients whose doctors recommended larger amounts could possess quantities consistent with their medical needs, and cities and counties could set higher limits than the state default.⁴ These caps were later struck down as applied to the Proposition 215 defense; see the next section.

The Voluntary ID Card Program

The law directed the State Department of Health Services to create a voluntary Medical Marijuana Identification Card, administered at the county level. Patients apply through their county health department with proof of residency, government-issued photo ID, and physician documentation of a serious medical condition. Counties verify the physician’s license and the recommendation, photograph the applicant, and approve or deny the application within 30 days.⁴

Cards are valid for one year, carry a unique ID number, and can be verified by law enforcement through a 24-hour toll-free line and an online database. The program is optional: patients can still claim Proposition 215 protections without a card, but cardholders get stronger protection, including immunity from arrest for possession, transportation, or cultivation within the specified limits.⁵ The state capped application and renewal fees at $100, with a 50 percent reduction for Medi-Cal beneficiaries.⁶

Primary Caregivers

A “primary caregiver” under SB 420 is someone designated by a patient who has consistently assumed responsibility for that patient’s housing, health, or safety. Caregivers must be at least 18, unless they are the parent of a minor patient or have legal authority to make medical decisions for the patient. They can be reimbursed for actual expenses and reasonably compensated for their services without losing legal protection.⁴ A caregiver serving multiple patients can aggregate limits: someone caring for three patients could possess up to 24 ounces and grow up to 18 mature plants.⁵

Collectives and Cooperatives

Section 11362.775 authorized qualified patients and caregivers to “associate within the State of California in order collectively or cooperatively to cultivate marijuana for medical purposes.” That language became the legal foundation for the medical marijuana dispensaries that spread across California in the following years.⁴

The law did not permit these groups to operate for profit. Under Attorney General guidelines, statutory cooperatives had to be organized as corporations under the Corporations or Food and Agricultural Code, operate democratically, and use earnings for the general welfare of members. Collectives were less formally defined but were expected to operate as closed-circuit systems, distributing only marijuana grown by their own members.⁵

Restrictions

SB 420 prohibited medical marijuana use in schools, on school buses, in motor vehicles or boats while being operated, and anywhere smoking was already banned by law. Dispensaries could not be located within 600 feet of a school. Fraudulent use of an identification card carried up to six months in jail or a $1,000 fine for a first offense, and up to one year for repeat offenses. Employers, jails, and correctional facilities were not required to accommodate medical marijuana use.⁶

How Kelly Changed the Possession Limits

The negotiated possession caps did not survive court review. Patrick Kevin Kelly was charged with possession for sale and cultivation after police found roughly 12 ounces of marijuana and several plants at his home. At trial, prosecutors leaned on SB 420’s eight-ounce limit to argue his possession exceeded the legal amount. A Court of Appeal panel reversed the conviction in 2008.⁷

On January 21, 2010, the California Supreme Court affirmed. It held that Section 11362.77, which set the eight-ounce and six-plant limits, “impermissibly amends the CUA and in that respect is invalid.” Under the California Constitution, the legislature cannot amend a voter-approved initiative without further voter approval unless the initiative allows it, and Proposition 215 did not. By imposing rigid caps that could override a medical-necessity defense, SB 420 narrowed a right the voters had created.⁸

The court did not void the entire program. It severed only the part of Section 11362.77 that burdened the Proposition 215 defense, leaving the ID card program, caregiver rules, and collective cultivation authorization in place. In practical terms, patients holding state ID cards can still use the possession numbers as a safe harbor, but prosecutors cannot use them as a ceiling to defeat a medical-necessity defense at trial.⁹

What Is Still in Effect After Proposition 64 and MAUCRSA

California’s cannabis rules changed again after voters approved Proposition 64, the Adult Use of Marijuana Act, in November 2016. The legislature then passed the Medicinal and Adult-Use Cannabis Regulation and Safety Act (MAUCRSA) to combine medical and recreational cannabis into a single licensing system.

MAUCRSA phased out the collective and cooperative model. Existing unlicensed collectives had to cease operating by January 2019, one year after the Bureau of Cannabis Control began issuing commercial licenses.¹⁰ The Bureau formally announced that Section 11362.775 was no longer in effect as of that date.¹¹ Medical cannabis nonprofits organized under SB 420 were allowed to reorganize as for-profit entities to fit the new licensing regime.

Protections for individual patients and primary caregivers cultivating for personal medical needs survived these changes, preserved under Proposition 215 itself rather than SB 420.

The ID Card Program Is Still Available

County health departments continue to process Medical Marijuana Identification Card applications, though fees vary widely. Shasta County charges $100, reduced to $50 for Medi-Cal recipients.¹² Orange County charges $84, with a half-price rate for Medi-Cal patients.¹³ Santa Clara County charges $10, reduced to $5 for seniors and Medi-Cal beneficiaries.¹⁴ The variation reflects the discretion counties have to set charges covering local administrative costs.

Since adult recreational use became legal, the card’s practical value has shrunk, but it still has uses. Cardholders may be exempt from some cannabis sales taxes depending on local rules, and the card provides a clean way to establish medical-patient status when that distinction matters.

What SB 420 Does Not Cover

A few limits are worth naming so you don’t read more into the law than it says. SB 420 governs medical marijuana; adult recreational use in California traces to Proposition 64 and MAUCRSA, not to SB 420. The law does not require employers, jails, or correctional facilities to accommodate medical marijuana use.⁶ It does not preempt federal law, which still classifies marijuana as a controlled substance. And after Kelly, the eight-ounce and six-plant figures no longer operate as prosecutable ceilings against a patient asserting a Proposition 215 defense; they function as a safe harbor for cardholders rather than a hard cap on all patients.

1
California NORML. SB 420 Establishes Prop 215 Guidelines, Voluntary Patient Identification Card System
2
U.S. General Accounting Office. Marijuana: Early Experiences With Four States’ Laws That Allow Use for Medical Purposes
3
vLex. People v. Mower, 28 Cal.4th 457
4
California Legislative Information. SB 420, Chapter 875, Statutes of 2003
5
San Diego County District Attorney’s Office. Attorney General Medical Marijuana Guidelines
6
California Legislative Information. Health and Safety Code, Article 2.5
7
California NORML. Court Strikes Down SB 420 Limits
8
Stanford Law School – Supreme Court of California Resources. People v. Kelly, 47 Cal.4th 1008
9
CAP Central. People v. Kelly, S164830
10
California NORML. The Medicinal and Adult-Use Cannabis Regulation and Safety Act (MAUCRSA)
11
Harris Sliwoski. California Announces End Date for Collectives and Cooperatives
12
Shasta County Health and Human Services. Medical Marijuana Identification Card Program
13
Orange County Health Care Agency. Medical Marijuana Identification Card Program
14
Santa Clara County Public Health Department. Apply for a Medical Marijuana Card