Forensic psychiatry is a diverse sub-specialty of psychiatry where psychiatrists treat patients involved with the criminal justice system. There are a number of settings in which patients can be referred to forensic health services- at the time of arrest, during court proceedings, or if they become ill in prison. Forensic psychiatrists work in a number of settings that include low secure, medium secure, high secure units, prisons and within the community. Secure units are secure psychiatric wards that are usually located out with a prison facility Neil.