“…In this treatment field, research underscores the importance of treatment completion to improve long-term outcomes for these young people [ 13 , 14 ]. Benefits of treatment completion or longer stays are shown to include lower levels of drug use, fewer arrests, increased employment rates and improved social engagement and psychological well-being following treatment compared with those who left the program early [ 12 , 15 , 16 , 17 , 18 , 19 ]. ‘Engagement’ in programs, not just time in treatment, has also been identified as important in ensuring positive outcomes from residential programs [ 18 , 20 , 21 , 22 , 23 ].…”