PCP is a highly addictive substance with numerous street names, including angel dust, peace pill, elephant tranquilizer, embalming fluid, dust, rocket fuel and more. Angel dust was originally used as an anesthetic by doctors and as a tranquilizer for animals. Doctors discontinued anesthetic use first because patients developed psychosis and other negative symptoms. Eventually, veterinarians stopped using it on animals, and now the substance is labeled as a Schedule II substance in the United States. Schedule II drugs are illegal to possess and are seldomly prescribed by medical professionals