Plaintiff, mental patient, released from hospital.
Subject to aftercare by defendant health authority.
Failed to attend appointments.
Committed manslaughter and sent to prison.
Sued health authority for failure to give him
treatment he needed.
Court of Appeal held that the rule of public policy
that a plaintiff should not be able to rely on his own criminal or immoral act
was restricted to those who knew what they were doing was unlawful.
Plaintiff did know
what he was doing, therefore court would not uphold his claim.