"Approximately half of all deaths in or following police custody involve detainees with some form of mental health problem. The IPCC is keen to get a better insight into the issues concerning mental health and custody. A key way in which individuals with mental disorder may have contact with the police is when they are in a public place and are believed to be in need of ‘immediate care and control. ... "
Please see: IPCC
BBC: Custody deaths represent failure...
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Doyle, M., Jones, P. (2013). Hodges’ Health Career Model and its role and potential application in forensic mental health nursing. Journal of Psychiatric and Mental Health Nursing. 20, 7, 631-640.