The SASSI Institute is proud to announce our newest manuscript addressing adolescent substance abuse. The title of this article is Mandated Treatment for Troubled Adolescents and Substance Use Disorder: Identifying and Breaking Through Defensiveness and Denial. It provides an investigation of the defensiveness demonstrated by teens who are mandated to participate in treatment as compared to their non-mandated peers. Part of the data set we collected for The Substance Abuse Subtle Screening Inventory (SASSI) Institute’s third iteration of the Adolescent SASSI-A3, the present study focused on data from 164 mandated teens that participated in the principal study. As in the principal study, these cases were drawn from substance use treatment, criminal justice programs, community corrections, and private clinical practices, among other venues, and all cases were provided by clinicians working within these service settings throughout all U.S. Census Regions. In addition, we review cases demonstrating high-levels of defensiveness and denial in these mandated teen clients, and ethical ways to break through that barrier towards effective treatment engagement. Finally, we present two brief de-identified treatment case studies, aptly demonstrating defensiveness and denial from a clinical standpoint. We at The SASSI Institute are very proud of this work, and I want to personally thank my co-authors for making this work possible. The article is available free of charge as it was submitted as an open-access article distributed under Creative Commons Attribution 4.0 International License (CC BY 4.0), which allows readers to copy, redistribute, remix, transform, and reproduce in any medium or format, as long as the original authors are properly cited.