Youth Dually-Involved in the child welfare and juvenile justice systems: Varying definitions and their associations with trauma exposure, posttraumatic stress, & offending

•Among youth involved in the juvenile justice system, youth with dual-system involvement according to self-report measure demonstrate significantly more exposure to traumatic events, more severe posttraumatic stress symptoms, and more self-reported offending.•In the present sample, there were few differences among youth on trauma-focused variables when dual-system involvement was operationalized with child welfare records.•The current results suggest that categorizing youth as crossover youth based on their own self-reported history of child maltreatment exposure resulted in more observed differences between dual-system youth and youth solely involved in juvenile justice.