According to the National Institute of Mental Health, 7.7 million Americans currently qualify as severely mentally disordered.

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But according to the National Institute of Mental Health, of the 7.7 million Americans who currently qualify as severely mentally disordered, less than half (3.5 million) never receive treatment.

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There is now a move to have the NHS taking over responsibility of health care in prisons, and that is resulting in an improvement in health care, although there's still a long way to go, particularly in the treatment of mentally disordered offenders.

BBC: News Online