A controlled substance is defined as a drug or its immediate precursor categorized in Schedules I–V under the Federal Controlled Substances Act. However, it is important to note that the definition explicitly excludes certain substances:
Additionally, psilocybin and psilocin are not considered controlled substances under this definition, but only if a person manufactures, delivers, or possesses them in accordance with the provisions of ORS 475A.210 to 475A.722 and the rules adopted under those statutes.
To secure a conviction for possession of a controlled substance, the state must provide evidence that supports all three of these elements beyond a reasonable doubt. If any of these elements cannot be proven, the defendant may not be found guilty of the offense.