Experimental Treatment: Multidimensional Family Therapy-Cross Systems (MDFT-CS). In Stage 1 (in detention) MDFT-CS, the experimental treatment, consists of two major components: standard initial/engagement work with parents in the home and with adolescents in detention (both conducted weekly for the duration of the adolescents stay in detention), plus a state-of-the-art HIV education prevention module based on CDC-endorsed strategies. The in-detention MDFT will be delivered by therapists employed by the University of Miami/ Center for Treatment Research on Adolescent Drug Abuse (CTRADA) who will continue to treat the youth and family after release from detention. In Stage 2, the experimental treatment includes the standard MDFT components (4 overall change units/targets: adolescent, parent, family interaction, and functioning of the family members vis a vis relevant extrafamilial social systems such as school and juvenile justice).