I knew a couple of guys in the '60s who were sniffing a lot of glue. They wound up in an institution in a vegetative state, permanently. Glue-sniffing kills brain cells.
http://www.sacsheriff.com/crime_prev...e_abuse_08.cfm
Treatment for schizophrenia back then may have included shock treatments and/or Thorazine. I don't think there was enough published information for him to be able to fake mental illness.
Maybe after 30 years, he'll be able to retire.