Here is an article about people in prisons with mental health problems. From reading it it's obvious that a lot of them are neg related. Like the two guys who are afraid of water or washing etc.
http://society.guardian.co.uk/mentalhealth/story/0,8150,1367331,00.html
http://society.guardian.co.uk/mentalhealth/story/0,8150,1367331,00.html