RecruitingBehavioural interventionPreventing School Exclusion and Opioid Misuse: Effectiveness of the Inclusive Skill-building Learning Approach (ISLA)This project will test the effectiveness of the Inclusive Skill-building Learning Approach (ISLA) in reducing the use of exclusionary discipline, improving teacher practice and student outcomes, and decreasing substance misuse using a randomized controlled trial in 60 middle schools across six states.