Adolescents will be evaluated for treatment non-response at 6, 9, 12, 15, and 18 months post-treatment. Non-response is defined as non-normative use of alcohol, marijuana, or other drugs during the past 90 days. Tobacco products are excluded from consideration. Adolescents who demonstrate non-response to the initial BEI at any of the follow-up assessments will be randomized to one of the following conditions: 1) Continued monitoring of substance use with no additional treatment 2) Parent training and adolescent cognitive behavioral therapy (PT/ACBT) 3) PT/ACBT plus concurrent stimulant medication (PT/ACBT + MED). Participants who are randomized will be assessed at 6 months post-treatment and again one year later. The difference in days of substance use at the follow-up assessments among the three conditions will inform which type of intervention is best for youth who do not respond to the initial BEI.