What Is 2020 Oregon Ballot Measure 109

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Last updated: April 15, 2026

Quick Answer: Oregon Ballot Measure 109, passed in November 2020, authorized the creation of licensed psilocybin service centers where adults 21+ can consume psilocybin mushrooms under supervision. The Oregon Health Authority began accepting license applications in January 2023.

Key Facts

Measure 109 passed on November 3, 2020, with 55.8% of the vote
Psilocybin services became legally available starting January 2, 2023
Only individuals aged 21 or older can legally access psilocybin services
The Oregon Health Authority oversees licensing and regulation of service centers
Over 120 psilocybin facilitator licenses were issued by mid-2023

Overview

2020 Oregon Ballot Measure 109, officially titled the Psilocybin Services Act, established a legal framework for supervised psilocybin mushroom use for individuals aged 21 and over. Unlike decriminalization measures, this law created a regulated system for therapeutic administration rather than general possession.

The initiative was designed to improve mental health outcomes by providing access to psilocybin-assisted therapy in controlled settings. It marked the first time a U.S. state legalized psilocybin use for therapeutic purposes through a voter-approved ballot measure.

Measure 109 was approved by voters on November 3, 2020, with approximately 55.8% support, reflecting growing public interest in alternative mental health treatments.
The law directed the Oregon Health Authority (OHA) to develop regulations for training, licensing, and overseeing psilocybin service providers and facilitators.
Unlike recreational drug legalization, Measure 109 does not allow for home use or unsupervised consumption—psilocybin must be administered at a licensed service center.
The initiative excluded law enforcement penalties for possession during the rulemaking phase, but full legal access began only after regulations were finalized in 2022–2023.
Psilocybin products used under this program must meet strict quality and purity standards set by the OHA to ensure participant safety and consistency.

How It Works

Measure 109 established a tiered system of licensing and training to ensure safe, equitable, and professional psilocybin services across Oregon. The program emphasizes client safety, informed consent, and cultural sensitivity.

Term: Psilocybin services must occur in a licensed facility with at least one trained facilitator present. The experience includes preparation, ingestion, and integration sessions.
Individuals must be at least 21 years old to participate, with no physician referral or diagnosis required—access is based on age, not medical need.
Licensed facilitators complete a state-approved training program of at least 120 hours, covering ethics, trauma-informed care, and emergency protocols.
Service centers must undergo state certification and comply with strict operational standards, including secure storage and client recordkeeping.
The initial dose session lasts 6–8 hours and is followed by an integration session to help participants process their experience.
The OHA maintains a public registry of licensed facilitators and service centers, allowing clients to verify credentials before scheduling sessions.

Comparison at a Glance

Measure 109 differs significantly from other drug policy reforms in scope, access, and regulatory structure. The table below highlights key distinctions:

Policy Type	Legal Access	Supervision Required	Age Limit	Medical Diagnosis Needed
Oregon Measure 109 (2020)	Licensed centers only	Yes, trained facilitator	21+	No
Colorado Prop 122 (2022)	Personal use & gifting	No (decriminalized)	21+	No
Washington D.C. Initiative 81	Decriminalized	No	None	No
California SB 519 (proposed)	Not enacted	N/A	21+	No
Traditional Psychedelic Retreats	Illegal in U.S.	Yes	Varies	No

While cities like Oakland and Santa Cruz have decriminalized natural psychedelics, Oregon’s approach is unique in creating a state-regulated, legal access model. This framework prioritizes safety and equity over broad decriminalization, setting a precedent for other states considering similar legislation.

Why It Matters

Measure 109 represents a landmark shift in U.S. drug policy, blending mental health innovation with regulated access. Its implementation offers insights into the feasibility of government-sanctioned psychedelic therapy programs.

Early data from licensed centers suggest improved mood and reduced anxiety in participants, aligning with clinical research on psilocybin’s therapeutic potential.
The program includes provisions for tribal sovereignty, allowing federally recognized tribes in Oregon to opt out or create their own regulations.
By removing criminal penalties and creating legal pathways, Measure 109 reduces stigma associated with psychedelic use for healing purposes.
Over 120 facilitators were licensed by mid-2023, indicating strong professional interest and workforce development in this emerging field.
The model may influence future federal policy, especially as the FDA examines psilocybin for treatment-resistant depression.
Oregon’s experience provides a real-world test of whether regulated psychedelic access can be implemented safely, equitably, and at scale.

As other states consider similar measures, Oregon’s implementation of Measure 109 serves as a critical case study in transforming drug policy through ballot initiatives grounded in public health.