alcohol and opioids slow brain activity and impair judgment, memory, intellectual performance, and motor coordination. Stimulants cause intense high, agitation, and paranoid behavior. Hallucinogens cause bizarre, inappropriate, sometimes violent behavior accompanied by superhuman strength and insensitivity to pain. Ask simple direct questions. Be nonthreatening. avoid confrontation. Find out the last time they drank or took drugs, how much, and the name of everything taken.