“…Known as a dual diagnosis, an estimated one third to one half of adults diagnosed with a mental illness also have a substance use disorder (Antai-Otong, Theis, & Patrick, 2016;Drake, Mueser, & Brunette, 2007; European Monitoring Centre for Drugs and Drug Addiction [EMCDDA], 2015; Petrakis, Robinson, Myers, Kroes, & O'Connor, 2018). Also referred to as having a concurrent disorder or a co-occurring disorder (EMCDDA, 2015), individuals in this subgroup face many challenges including being more likely to have added health problems (Drake et al, 2006;Rosenberg, Drake, Brunette, Wolford, & Marsh, 2005) as well as being at increased risk for adverse outcomes, including treatment nonadherence and suicide (Beeber & Stein, 2015;Cosci & Fava, 2011;Czobor et al, 2015;Drake, O'Neal, & Wallach, 2008;Greenberg & Rosenheck, 2014;Jacobs et al, 2010;Krausz et al, 2013;Montes, Maurino, de Dios, & Medina, 2013;Roque, Findlay, Okoli, & El-Mallakh, 2017;Sendt, Tracy, & Bhattacharyya, 2015). The frequency of emergency room visits as well as hospital readmission rates and length of stay are significantly higher for patients with a dual diagnosis than for those with either a mental illness or a substance use disorder alone (Antai-Otong et al, 2016;Cosci & Fava, 2011;Drake et al, 2008;Jacobs et al, 2010).…”