William R. Lindsay, PhD, was a Consultant Forensic Clinical Psychologist and Head of Research for Danshell, and Professor of Learning Disabilities and Forensic Psychology at Abertay University, Dundee, Scotland. Leam A. Craig, PhD, is a Consultant Forensic Clinical Psychologist and Partner at Forensic Psychology Practice Ltd. He is a visiting Professor of Forensic Clinical Psychology, Birmingham City University, Hon. Professor of Forensic Psychology, University of Birmingham, and Hon. Assoc. Professor of Forensic Psychology, University of Nottingham, UK. Dorothy Griffiths, PhD, is Emerita Professor at the Department of Child and Youth Studies and Centre for Applied Disability Studies, and former Co-Director of the International Dual Diagnosis Certificate Programme, Brock University, St. Catharines, Ontario, Canada.

• Acknowledgements ixAbout the Editors xiNotes on Contributors xiiiForeword xxiiiPart I Introduction 11 What Works for Offenders with Intellectual and Developmental Disabilities: Systems for Evaluating Evidence and Book Overview 3Leam A. Craig, William R. Lindsay, and Dorothy Griffiths2 What Works: Ethical Considerations When Treating Offenders with Intellectual and Developmental Disabilities 17Dorothy Griffiths3 Protecting the Rights of People with Intellectual Disabilities in Correctional Settings 41Frank Lambrick, Astrid Birgden, Chelsea Troutman, and Danielle McLeodPart II Phenotypes and Genotypes and Offending Behaviour 674 Behavioural and Cognitive Phenotypes in Genetic Disorders Associated with Offending 69Lauren J. Rice, Stewart L. Einfeld, and Patricia HowlinPart III Validated Assessments 975 Diagnosis of Personality Disorder in Offenders with Intellectual and Developmental Disabilities 99Nigel Beail6 Assessment of Anger and Aggression 113Paul Willner, Andrew Jahoda, and Ken MacMahon7 Psychological Assessment Procedures for Sex Offenders with Intellectual and Developmental Disabilities 133Lesley R. Steptoe and Amanda M. Michie8 Assessment for Social Problem‐Solving, Social Information Processing, and Criminal Thinking 167Peter E. Langdon9 Assessment of Alcohol Use Disorder and Alcohol‐Related Offending Behaviour 181Joanne E.L. VanDerNagel, Neomi van Duijvenbode, and Robert Didden10 Assessing People with Intellectual Disabilities Who Have Engaged in Fire Setting 193Samuel J. Tromans, Verity Chester, and Regi T. Alexander11 Biopsychosocial Assessment Approach for Offenders with Intellectual Disabilities 219Deborah Richards, Tyler Oswald, and J. Paul Fedoroff12 Using a Multicomponent Model in the Assessment of Persons with Intellectual Disabilities and Problems in Sexual Behaviour 239Robin J. Wilson, Stephanie Ioannou, and Kendra ThomsonPart IV Treatment 26113 Supporting People with Intellectual and Developmental Disabilities Leaving Prison 263Kathy Ellem, Michelle Denton, and Danielle Davidson14 Prison‐based Programmes for People with Intellectual and Developmental Disabilities 283Phillip Snoyman, Berindah Aicken, and Jayson Ware15 Treatment of Anger and Violence in Individuals with Intellectual Disability 297Robert Didden, Henk Nijman, Monique Delforterie, and Marije Keulen‐De Vos16 Treatment of Inappropriate Sexual Behaviour by People with Intellectual Developmental Disabilities 311Leam A. Craig17 Treatment for Social Problem Solving and Criminal Thinking 327Susan Hayes18 Treating Substance Misuses Amongst Offenders with Intellectual and Developmental Disabilities 341Danielle Newton and Jane McGillivray19 Treatment for Emotional Difficulties Related to Offending for People with an Intellectual Disability 357Paul Oxnam and Emma Gardner20 Treatment Outcomes for People with Autistic Spectrum Disorder in Forensic Settings 373Peter Sturmey21 Pharmacological Approaches for Offenders with Intellectual and Developmental Disabilities 389Daniel Turner and Peer BrikenPart V Conclusions 40522 Future Directions for What Works for Offenders with Intellectual and Developmental Disabilities 407Dorothy Griffiths and Leam A. CraigIndex 421

William R. Lindsay, PhD, was a Consultant Forensic Clinical Psychologist and Head of Research for Danshell, and Professor of Learning Disabilities and Forensic Psychology at Abertay University, Dundee, Scotland. Leam A. Craig, PhD, is a Consultant Forensic Clinical Psychologist and Partner at Forensic Psychology Practice Ltd. He is a visiting Professor of Forensic Clinical Psychology, Birmingham City University, Hon. Professor of Forensic Psychology, University of Birmingham, and Hon. Assoc. Professor of Forensic Psychology, University of Nottingham, UK. Dorothy Griffiths, PhD, is Emerita Professor at the Department of Child and Youth Studies and Centre for Applied Disability Studies, and former Co-Director of the International Dual Diagnosis Certificate Programme, Brock University, St. Catharines, Ontario, Canada.

• Acknowledgements ixAbout the Editors xiNotes on Contributors xiiiForeword xxiiiPart I Introduction 11 What Works for Offenders with Intellectual and Developmental Disabilities: Systems for Evaluating Evidence and Book Overview 3Leam A. Craig, William R. Lindsay, and Dorothy Griffiths2 What Works: Ethical Considerations When Treating Offenders with Intellectual and Developmental Disabilities 17Dorothy Griffiths3 Protecting the Rights of People with Intellectual Disabilities in Correctional Settings 41Frank Lambrick, Astrid Birgden, Chelsea Troutman, and Danielle McLeodPart II Phenotypes and Genotypes and Offending Behaviour 674 Behavioural and Cognitive Phenotypes in Genetic Disorders Associated with Offending 69Lauren J. Rice, Stewart L. Einfeld, and Patricia HowlinPart III Validated Assessments 975 Diagnosis of Personality Disorder in Offenders with Intellectual and Developmental Disabilities 99Nigel Beail6 Assessment of Anger and Aggression 113Paul Willner, Andrew Jahoda, and Ken MacMahon7 Psychological Assessment Procedures for Sex Offenders with Intellectual and Developmental Disabilities 133Lesley R. Steptoe and Amanda M. Michie8 Assessment for Social Problem‐Solving, Social Information Processing, and Criminal Thinking 167Peter E. Langdon9 Assessment of Alcohol Use Disorder and Alcohol‐Related Offending Behaviour 181Joanne E.L. VanDerNagel, Neomi van Duijvenbode, and Robert Didden10 Assessing People with Intellectual Disabilities Who Have Engaged in Fire Setting 193Samuel J. Tromans, Verity Chester, and Regi T. Alexander11 Biopsychosocial Assessment Approach for Offenders with Intellectual Disabilities 219Deborah Richards, Tyler Oswald, and J. Paul Fedoroff12 Using a Multicomponent Model in the Assessment of Persons with Intellectual Disabilities and Problems in Sexual Behaviour 239Robin J. Wilson, Stephanie Ioannou, and Kendra ThomsonPart IV Treatment 26113 Supporting People with Intellectual and Developmental Disabilities Leaving Prison 263Kathy Ellem, Michelle Denton, and Danielle Davidson14 Prison‐based Programmes for People with Intellectual and Developmental Disabilities 283Phillip Snoyman, Berindah Aicken, and Jayson Ware15 Treatment of Anger and Violence in Individuals with Intellectual Disability 297Robert Didden, Henk Nijman, Monique Delforterie, and Marije Keulen‐De Vos16 Treatment of Inappropriate Sexual Behaviour by People with Intellectual Developmental Disabilities 311Leam A. Craig17 Treatment for Social Problem Solving and Criminal Thinking 327Susan Hayes18 Treating Substance Misuses Amongst Offenders with Intellectual and Developmental Disabilities 341Danielle Newton and Jane McGillivray19 Treatment for Emotional Difficulties Related to Offending for People with an Intellectual Disability 357Paul Oxnam and Emma Gardner20 Treatment Outcomes for People with Autistic Spectrum Disorder in Forensic Settings 373Peter Sturmey21 Pharmacological Approaches for Offenders with Intellectual and Developmental Disabilities 389Daniel Turner and Peer BrikenPart V Conclusions 40522 Future Directions for What Works for Offenders with Intellectual and Developmental Disabilities 407Dorothy Griffiths and Leam A. CraigIndex 421

William R. Lindsay, PhD, was a Consultant Forensic Clinical Psychologist and Head of Research for Danshell, and Professor of Learning Disabilities and Forensic Psychology at Abertay University, Dundee, Scotland. Leam A. Craig, PhD, is a Consultant Forensic Clinical Psychologist and Partner at Forensic Psychology Practice Ltd. He is a visiting Professor of Forensic Clinical Psychology, Birmingham City University, Hon. Professor of Forensic Psychology, University of Birmingham, and Hon. Assoc. Professor of Forensic Psychology, University of Nottingham, UK. Dorothy Griffiths, PhD, is Emerita Professor at the Department of Child and Youth Studies and Centre for Applied Disability Studies, and former Co-Director of the International Dual Diagnosis Certificate Programme, Brock University, St. Catharines, Ontario, Canada.

• Acknowledgements ixAbout the Editors xiNotes on Contributors xiiiForeword xxiiiPart I Introduction 11 What Works for Offenders with Intellectual and Developmental Disabilities: Systems for Evaluating Evidence and Book Overview 3Leam A. Craig, William R. Lindsay, and Dorothy Griffiths2 What Works: Ethical Considerations When Treating Offenders with Intellectual and Developmental Disabilities 17Dorothy Griffiths3 Protecting the Rights of People with Intellectual Disabilities in Correctional Settings 41Frank Lambrick, Astrid Birgden, Chelsea Troutman, and Danielle McLeodPart II Phenotypes and Genotypes and Offending Behaviour 674 Behavioural and Cognitive Phenotypes in Genetic Disorders Associated with Offending 69Lauren J. Rice, Stewart L. Einfeld, and Patricia HowlinPart III Validated Assessments 975 Diagnosis of Personality Disorder in Offenders with Intellectual and Developmental Disabilities 99Nigel Beail6 Assessment of Anger and Aggression 113Paul Willner, Andrew Jahoda, and Ken MacMahon7 Psychological Assessment Procedures for Sex Offenders with Intellectual and Developmental Disabilities 133Lesley R. Steptoe and Amanda M. Michie8 Assessment for Social Problem‐Solving, Social Information Processing, and Criminal Thinking 167Peter E. Langdon9 Assessment of Alcohol Use Disorder and Alcohol‐Related Offending Behaviour 181Joanne E.L. VanDerNagel, Neomi van Duijvenbode, and Robert Didden10 Assessing People with Intellectual Disabilities Who Have Engaged in Fire Setting 193Samuel J. Tromans, Verity Chester, and Regi T. Alexander11 Biopsychosocial Assessment Approach for Offenders with Intellectual Disabilities 219Deborah Richards, Tyler Oswald, and J. Paul Fedoroff12 Using a Multicomponent Model in the Assessment of Persons with Intellectual Disabilities and Problems in Sexual Behaviour 239Robin J. Wilson, Stephanie Ioannou, and Kendra ThomsonPart IV Treatment 26113 Supporting People with Intellectual and Developmental Disabilities Leaving Prison 263Kathy Ellem, Michelle Denton, and Danielle Davidson14 Prison‐based Programmes for People with Intellectual and Developmental Disabilities 283Phillip Snoyman, Berindah Aicken, and Jayson Ware15 Treatment of Anger and Violence in Individuals with Intellectual Disability 297Robert Didden, Henk Nijman, Monique Delforterie, and Marije Keulen‐De Vos16 Treatment of Inappropriate Sexual Behaviour by People with Intellectual Developmental Disabilities 311Leam A. Craig17 Treatment for Social Problem Solving and Criminal Thinking 327Susan Hayes18 Treating Substance Misuses Amongst Offenders with Intellectual and Developmental Disabilities 341Danielle Newton and Jane McGillivray19 Treatment for Emotional Difficulties Related to Offending for People with an Intellectual Disability 357Paul Oxnam and Emma Gardner20 Treatment Outcomes for People with Autistic Spectrum Disorder in Forensic Settings 373Peter Sturmey21 Pharmacological Approaches for Offenders with Intellectual and Developmental Disabilities 389Daniel Turner and Peer BrikenPart V Conclusions 40522 Future Directions for What Works for Offenders with Intellectual and Developmental Disabilities 407Dorothy Griffiths and Leam A. CraigIndex 421