We report the results of a test of a structural model reflecting the longitudinal relationships of psychosocial problems among youths involved in a Center for Substance Abuse Treatment funded clinical trial for juveniles that participated in a diversion program. The project is evaluating the efficacy of an intensive 16-week case management service to youths and their families. The present study examines the continuity of (1) psychosocial problems, measured as a latent variable comprising family problems, peer problems, and educational problems, (2) drug involvement, use, and effects, and (3) self-reported delinquency for baseline and approximately 1-year follow-up interview data for 165 and 137 youths, respectively. The results support existing literature indicating that once problem behaviors are established at an early age, they have a strong likelihood of persisting over time. Implications for policy and intervention service needs are discussed.