Prison inmate health surveys consistently show high proportions of prisoners have mental health problems; however, scholarly opinion is divided on the contribution of mental illness to offending. Some contend that mental illness is not a cause of offending and that mental health treatment will not reduce offending. Others maintain mental health treatment can reduce the risk of offending among persons with a significant mental illness. In this article we report the results of a rigorous evaluation of the effectiveness of mental health treatment in reducing offending amongst a cohort of defendants with a diagnosis of psychosis. We find evidence that the provision of mental health treatment to defendants with a psychotic illness does significantly reduce the risk of further offending.
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