Is Psilocybin Legal in the US? Federal and State Status Explained

Is Psilocybin Legal in the US? The Plain-English Answer

No, psilocybin is not legal under United States federal law. Psilocybin—the active compound in so-called “magic mushrooms”—is classified as a Schedule I controlled substance under the federal Controlled Substances Act (CSA). This means it is considered to have a high potential for abuse, no currently accepted medical use in treatment, and a lack of accepted safety for use under medical supervision. There are no US Food and Drug Administration (FDA)-approved medical products containing psilocybin. However, a small number of state-level programs (notably in Oregon and Colorado) allow regulated therapeutic use of psilocybin under specific conditions. This explainer provides a curated, authoritative overview of psilocybin’s legal status in the US as of today. This is general information and does not constitute legal advice.

Federal Law: Schedule I Status and Its Implications

Psilocybin was placed in Schedule I of the Controlled Substances Act in 1970. Schedule I is the most restrictive drug category, reserved for substances with:

• High potential for abuse
• No currently accepted medical use in the US
• Lack of accepted safety for use under medical supervision

This means that, at the federal level, it is illegal to manufacture, possess, distribute, or use psilocybin outside of strictly regulated research settings. Violations can result in severe criminal penalties. The US Drug Enforcement Administration (DEA) enforces these controls, and the FDA has not approved psilocybin for any medical indication.

There are, however, ongoing clinical trials evaluating psilocybin’s safety and efficacy for conditions such as depression and post-traumatic stress disorder (PTSD). These trials operate under special federal research licenses and do not change the substance’s Schedule I status for the general public. For more on the current research environment, see our psychedelic research landscape overview.

State-Level Exceptions: Oregon and Colorado

While federal law prohibits psilocybin, two US states have created regulated programs for therapeutic use:

Oregon (Measure 109)

In 2020, Oregon voters passed Measure 109, establishing a state-regulated framework for licensed psilocybin services. The program launched in 2023. Under Oregon law, adults aged 21 and over can access supervised psilocybin sessions at licensed service centers, guided by trained facilitators. Importantly, psilocybin remains illegal to possess, grow, or distribute outside this regulated system, and federal law still applies in Oregon.

Colorado (Proposition 122)

Colorado voters approved Proposition 122 in 2022, launching a similar regulated access program. The state began rolling out licensed psilocybin services in 2024-2025. Like Oregon, the Colorado framework allows for supervised, non-medical adult use at licensed facilities. Personal cultivation and sharing of psilocybin mushrooms in limited quantities is also decriminalized, but commercial sales remain prohibited outside the regulated system.

It is important to note that these state-level programs do not override federal law. Federal authorities retain the power to enforce the Controlled Substances Act, although enforcement priorities may vary. For more on the evolving legal landscape, see our psychedelic law guide.

Psilocybin in Clinical Trials: FDA and Drug Development Status

Psilocybin is being studied in clinical trials for several mental health conditions. Two major programs are in Phase 3 (the final stage before potential FDA approval):

• COMPASS Pathways (COMP360): A proprietary synthetic psilocybin formulation for treatment-resistant depression, with Phase 3 results expected through 2025-2026.
• Usona Institute (IPR001): A non-profit trial of psilocybin for major depressive disorder, also in Phase 3.

Until the FDA reviews and approves a psilocybin-based therapy, psilocybin remains illegal for general medical use. Participation in approved clinical trials is the only federally legal way for most people to access psilocybin in the US. For a broader view of clinical research and access pathways, visit our start here guide and briefing feed.

Common Questions About Psilocybin Legality

Can I legally possess or use psilocybin mushrooms in the US?

Outside of Oregon and Colorado’s regulated programs, possession, cultivation, or use of psilocybin mushrooms is illegal in all US states under both federal and (in most cases) state law.

Does decriminalization mean psilocybin is legal?

No. Decriminalization typically means that criminal penalties for personal possession are reduced or eliminated, but the substance remains illegal to sell, distribute, or use outside specific programs. Decriminalization does not make psilocybin “legal.”

What about religious or spiritual use?

Some religious groups have sought exemptions for psilocybin use under the Religious Freedom Restoration Act (RFRA), but such exemptions are rare and legally complex. They do not apply to the general public.

Can doctors prescribe psilocybin?

No, doctors cannot legally prescribe psilocybin outside of clinical trials or state-regulated therapy programs in Oregon and Colorado. There are no FDA-approved psilocybin medications.

What’s Next? Staying Informed and Navigating Legal Risks

The legal status of psilocybin in the US remains complex and subject to change as clinical evidence grows and state-level reforms continue. Key developments to watch include:

• Results from Phase 3 clinical trials (COMPASS Pathways, Usona Institute)
• Potential future FDA review and rescheduling
• Expansion or revision of state-level programs

For the latest updates, see our briefing feed and guides on psychedelic law and research. If you are a researcher, policy professional, or investor, our tools and research landscape provide additional resources.

Disclaimer: This article is for informational purposes only and does not constitute legal advice. Consult a qualified attorney for guidance on specific legal questions.