This randomized controlled study assessed the efficacy of a structured group therapy for traumatized, adjudicated adolescents in residential treatment. Youth were randomly assigned to a trauma intervention (SITCAP-ART) or to a waitlist/comparison group. The intervention included both sensory and cognitive/behavioral components. Standardized trauma and mental health measures were used. Study participants demonstrated statistically significant reductions in trauma symptoms, depression, rule breaking behaviors, aggressive behaviors and other mental health problems.