All Initiatives

A.G. File No. 2023-004

June 29, 2023


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Pursuant to Elections Code Section 9005, we have reviewed the proposed statutory initiative related to psilocybin (A.G. File No. 23-0004).


Psilocybin. Psilocybin is a naturally occurring hallucinogen found in certain species of mushrooms that are often referred to as psychedelic or “magic” mushrooms. When a person uses psilocybin—typically by ingesting mushrooms containing it—the user can temporarily experience hallucinations as well as changes in thoughts and emotions. Psilocybin is currently being studied to assess its potential therapeutic benefits for treating various conditions including depression and addiction.

State Law. Under current state law, the cultivation, possession, distribution, transportation, and sale of psilocybin outside of an approved research setting is generally illegal in California. Penalties for adults for psilocybin-related activities vary depending on the offense. For example, possession of psilocybin is generally punishable as a misdemeanor and may result in up to a one-year sentence in county jail and/or a fine, while selling psilocybin is a felony and may result in a jail or state prison sentence. Currently, there are very limited data specifically for psilocybin-related offenses. However, we estimate that the number of people in state prison and county jail for such offenses is very minor relative to the overall prison and jail population. There are also limited data on penalties received by juveniles for psilocybin-related offenses, which can differ depending on the circumstances of the offense. However, available data indicate that custodial placements are very rare. This suggests that juveniles are instead generally placed in diversion programs or on informal probation for these offenses.

Federal Law. Federal laws classify psilocybin as an illegal substance and provide criminal penalties for various activities relating to its use outside of an approved research setting. These laws are enforced by federal agencies that may act independently or in cooperation with state and local law enforcement agencies.


This measure makes various changes to state law related to psilocybin, including removing certain criminal penalties and requiring regulation of its cultivation and sale. However, federal restrictions on psilocybin would still be in effect. We describe key provisions of the measure below.

Legalizes Psilocybin-Related Activities Under State Law. The measure eliminates existing penalties under state law for people 21 years of age and over who engage in psilocybin-related activities including, possession, distribution, transportation, and sale of psilocybin. The measure also allows people 21 years of age and over to cultivate psilocybin mushrooms subject to certain limitations, such as requiring the mushrooms to not be publicly visible. These activities would generally remain illegal for people under the age of 21 who engage in them without parental consent. However, the measure limits the maximum punishment for such people to a mandatory drug education program. The measure also states that people who previously served sentences for offenses that would no longer be unlawful under the measure could petition the court to seal the record of their conviction. Activities related to the use of psilocybin would continue to be prohibited under federal law.

Requires Regulation of Psilocybin Cultivation and Sales. The measure requires that psilocybin mushrooms and psilocybin mushroom businesses be regulated by the California Department of Food and Agriculture (CDFA) as closely as practicable to “non-psychoactive agriculturally produced mushrooms,” except that it would impose specific requirements for labeling of psilocybin mushroom products. Under the measure, psilocybin mushroom businesses would be permitted to begin cultivation, manufacturing, and wholesale distribution of psilocybin mushrooms on January 1, 2025 provided they are operating on land that is zoned for commercial agricultural production and approved by CDFA for food production. Beginning on April 19, 2025, businesses would be allowed to begin retail sales of psilocybin. Regulatory agencies would be prohibited from imposing fines or fees in excess of the amount charged for comparable non-psilocybin mushroom-related businesses.

Under the measure, a city or county could ban or limit the number of psilocybin mushroom businesses within its boundaries if approved by the voters within that jurisdiction at a statewide election held in November.

Specifies Use of Psilocybin for Treatment Purposes. The measure specifies that health care practitioners may use psilocybin for treatment purposes—including to treat people under the age of 21—subject to certain limits, such as requiring practitioners to obtain specialized certifications. In addition, the measure requires the California Department of Consumer Affairs and the California Health and Human Services Agency to adopt and implement the qualification requirements and protocols for psilocybin mushroom-assisted therapy created by an “independent professional certifying body.”

Limits Taxation of Psilocybin. The measure exempts psilocybin grown or sold for medical, therapeutic, religious, or spiritual purposes from state and local sales, use, and excise taxes. Under the measure, psilocybin products labeled and sold for recreational use would be taxed at the local sales tax rate.

Fiscal Effects

Reduced Psilocybin-Related Criminal Justice System Costs. The measure would reduce ongoing costs to the state and local governments by reducing the number of people convicted of psilocybin offenses incarcerated in state prison and county jail, as well as the number placed under community supervision (such as county probation). The measure would also result in a reduction in state and local costs for the enforcement of psilocybin-related offenses and the handling of related criminal cases in the state court system. However, the measure would increase state and local government costs due to processing petitions for the sealing of psilocybin-related convictions. In total, we estimate that the measure would likely result in a net reduction in costs of less than a few million dollars annually. In many cases, these resources would likely be redirected to other law enforcement, corrections, and court activities.

Increased Regulatory Costs. State costs to regulate psilocybin mushroom businesses and psilocybin treatment providers would depend on (1) the specific regulatory structure that the state ultimately implements pursuant to the measure, (2) the extent to which the federal government exercises its discretion to enforce federal prohibitions on psilocybin-related activities, and (3) how people and businesses respond to these two factors. Accordingly, costs could range from minimal to tens of millions of dollars annually. These regulatory costs could eventually be partially or fully offset by regulatory fee revenue. To the extent that fee revenues are not sufficient to fully support such costs, some of the costs could require support from other funding sources (such as the state General Fund).

Potential Impact on State and Local Tax Revenues. The measure could result in some increase in tax revenue, as people selling psilocybin or providing related services could begin doing so legally under state law and therefore pay sales and personal income taxes. The overall impact on state and local tax revenue would depend on various factors, such as how people and businesses respond to the regulatory structure and the extent that the federal government exercises its discretion to enforce federal prohibitions on psilocybin-related activities.

Summary of Fiscal Effects. We estimate that this measure would have the following major fiscal effects:

  • Net reduction in costs, not likely to exceed a few million dollars annually, to state and local governments related to enforcing psilocybin-related offenses, handling the related criminal cases and sealing of records in the court system, and incarcerating and supervising people convicted of psilocybin-related offences.
  • Annual state costs to regulate psilocybin businesses and treatment providers, ranging from minimal to tens of millions of dollars. These costs could eventually be partially or fully offset by regulatory fee revenue.