Book excerpt: 1. Youth with mental health disorders in the juvenile justice system-- 2. The diagnosis of mental health disorders-- 3. The oppositional defiant disorder and conduct disorder-- 4. Mood disorders : major depression, dysthymic disorder and bipolar disorder-- 5. Attention-deficit - hyperactivity disorder (ADHD)-- 6. Posttraumatic stress disorder (PTSD)-- 7. Developmental disorders : mental retardation, learning disorders and fetal alcohol syndrome (FAS)-- 8. Schizophrenia and other psychotic disorders-- 9. Substance use disorders : substance abuse and substance dependence-- 10. Co-occuring mental health and substance use disorders -- 11. Suicidal behaviour among juvenile offenders-- 12. Self-injurious behaviour among juvenile offenders-- 13. Screening and assessment of juvenile offenders with mental health disorders-- 14. Treatment of juvenile offenders with mental health disorders-- 15. Special issues 1 : minority youth, female offenders, homosexual youth-- 16. Special issues 2 : head trauma - neuropsychiatric factors, violence and mental illness, seclusion and restraint, malingering, staff training.