This study will focus on treating substance abusing incarcerated teens using individually administered Motivational Interviewing (MI) followed by group Cognitive Behavior Therapy (CBT). The control group receives individualized Relaxation Training (RT) followed by group Treatment as Usual (TU). Currently, there is little research regarding effective group treatments for incarcerated teens and this study will address this gap in our knowledge base. We seek to reduce substance use and associated risky behaviors post-release (including driving under the influence, risky sexual behaviors, etc.).