The past three years have been monumental for psilocybin, a term that had not seen much popularity in the news or our legal system prior to the past 10 years. This compound naturally occurs in psilocybin mushrooms, better known colloquially and in popular culture as "magic mushrooms." It is listed as a Schedule I controlled substance, like cannabis; both were categorized as such in 1970 as part of the Federal Controlled Substances Act.