Despite the seemingly strict provisions of the law, many people were exempt from prosecution. The statutes "permit… people to possess such drugs so long as they were for the personal use of the possessor, [for a member of his household, or for administration to an animal". The federal law that specifically banned psilocybin and psilocin was enacted on October 24, 1968. The substances were said to have "a high potential for abuse", "no currently accepted medical use," and "a lack of accepted safety". On October 27, 1970, both psilocybin and psilocin became classified as Schedule I drugs and were simultaneously labeled "hallucinogens" under a section of the Comprehensive Drug Abuse Prevention and Control Act known as the Controlled Substances Act. Schedule I drugs are illicit drugs that are claimed to have no known therapeutic benefit. Johns Hopkins researchers suggest that if psilocybin clears the current phase III clinical trials, it should be re-categorized to a schedule IV drug such as prescription sleep aids, but with tighter control.