Overdose prevention centers (OPCs) are facilities where controlled substances, obtained outside the center, may be consumed in a safe environment with monitoring by staff.  These centers are intended to lessen the risk of overdose and often also provide access to critical services such as syringe exchange, fentanyl test strip and naloxone distribution, and referrals to treatment for infectious diseases and substance use disorder.  

At the federal level, the sale and possession of marijuana is illegal under the Controlled Substances Act of 1970. Alaska, Colorado, the District of Columbia, Oregon, and Washington State, however, have enacted laws that legalize marijuana use for recreational purposes. In these five jurisdictions, an individual 21 years old or older can possess a limited amount of marijuana.