PCPS
4 letters
Historical clue formulations
- H.M.O. doctor designations — 2016-02-23
- Psychedelic drugs, for short — 2012-06-06
- Some hallucinogens, for short — 2009-10-15
- Some hallucinogens, for short — 2006-07-30
- Illicit drugs, briefly — 2003-12-28
- Some hallucinogens — 1998-10-31