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A limited number of dedicated forensic mental health services are available for serious offenders with severe personality disorder. The recent Offender Personality Disorder (OPD) strategy aims to ensure that most such offenders are treated in prison rather than secure psychiatric services, except in highly complex cases where this is not possible. While the strategy sets out very broad criteria relating to this, greater clarity is needed to support decisions about appropriate transfer and hence enhance public protection. This study explored which characteristics professional experts associate with appropriate transfer from prison to forensic mental health services for high-risk offenders with PD.<\/jats:p><\/jats:sec><jats:sec><jats:title>Method<\/jats:title><jats:p>A modified Delphi survey distributed through an online survey system was conducted in two-rounds with a group of professional experts recruited from forensic mental healthcare; criminal justice and specialist commissioning.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Fifty-one (56%) respondents completed stage one of the Delphi and 34 (61%) of these completed stage two. Consensus was reached for a total of 22 items indicating complexity, including co-morbid mental illness, high level of risk, lack of progress in prison and high motivation for treatment. A preliminary checklist for these factors was developed. Panel members consistently emphasised the importance of the individual\u2019s presenting need, the overall clinical picture and formulation in their free text responses.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Professionals face a complex picture when making decisions regarding suitability for hospital admission for high-risk male offenders with PD, with varied opinions amongst professional experts as to priorities for intervention and a focus on individual needs through formulation. It was, nevertheless, possible to condense these views into a set of consistent variables that can be used to highlight the need for transfer into hospital-based treatment services.<\/jats:p><\/jats:sec>","DOI":"10.1186\/s12888-019-2268-3","type":"journal-article","created":{"date-parts":[[2019,9,10]],"date-time":"2019-09-10T05:46:08Z","timestamp":1568094368000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["\u201cWho needs secure services for personality disorder?\u201d Results of an expert Delphi study with professional staff"],"prefix":"10.1186","volume":"19","author":[{"given":"Zoe","family":"Foyston","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Celia","family":"Taylor","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0992-8468","authenticated-orcid":false,"given":"Mark","family":"Freestone","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2019,9,10]]},"reference":[{"key":"2268_CR1","doi-asserted-by":"publisher","DOI":"10.1176\/appi.books.9780890425596","volume-title":"Diagnostic and statistical manual of mental disorders","author":"American Psychiatric Association","year":"2013","unstructured":"American Psychiatric Association. 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