Presents information on identifying, screening, and assessing adolescents who use substances. This report focuses on the most current procedures and instruments for detecting substance abuse among adolescents, conducting comprehensive assessments, and beginning treatment planning. Presents appropriate strategies and guidelines for screening and assessment. Explains legal issues concerning Federal and State confidentiality laws. Provides guidance for screening and assessing adolescents in juvenile justice settings. Summarizes instruments to screen and assess adolescents for substance and general functioning domains.