“…Studies have documented reductions in substance use among patients with SUDs attending MHGs (Gossop et al, 2003; Schonbrun et al, 2011; Timko, DeBenedetti, & Billow, 2006), especially with more frequent and sustained attendance (Kaskutas, 2009). Further, as SUDs are a major predictor of criminal involvement (Mateyoke-Scrivner et al, 2003), MHGs that improve SUD outcomes may also improve legal outcomes (Timko, Moos, & Moos, 2009). For example, Blonigen, Timko, and Moos (2013) found that, among 686 patients diagnosed with alcohol use disorders, longer duration of MHG attendance reduced impulsivity, which was linked with fewer legal problems.…”