“…However, this group also presents a challenge for substance misuse services because of high treatment dropout rates (Schulte, Meier, Stirling, & Berry, 2008), and engagement and retention difficulties (Barrowclough, Meier, Beardmore, & Emsley, 2010;Cleary, Hunt, Matheson, Siegfried, & Walter, 2008). This presents a growing global problem for services (Drake, 2004;Pozzi, Frustaci, Janiri, & Giannantonio, 2006;Urbanoski, Cairney, Bassani, & Rush, 2008).…”