‘Misidentified Man’ Mistakenly Locked Up in Psychiatric Hospital, Injected with Powerful Antipsychotic Drug (gawker.com)
A psychiatric hospital in Western Australia is in the process of determining how a healthy man came to be held at the facility and injected with antipsychotic drugs after being mistaken for a runaway patient.

The unidentified man was picked up by police on December 16th and brought to Graylands Hospital in Perth because he matched the description of an involuntary patient who ran away two days earlier.

Hospital staff also mistook the man for his mentally ill doppelganger and injected him with a dose of Clozapine — a strong anti-schizophrenia medication often only administered when other antipsychotics fail.
Meanwhile, the escaped patient returned on his own to the hospital that same day.
the rest of the story, with links, at link above

Also see: Wrong man held, drugged at Graylands Mental Hospital (news.com.au)