Section 475A.345 - Preparation session(1) Before a client participates in an administration session, the client must attend a preparation session with a psilocybin service facilitator.(2) A preparation session may be, but need not be, held at a psilocybin service center.(3) If a preparation session is completed in accordance with all applicable requirements, specifications and guidelines, as determined by the Oregon Health Authority, the psilocybin service facilitator must certify, in a form and manner prescribed by the authority, that the client completed the preparation session.