“…On a given night in 2014, approximately 20% of the homeless population had a serious mental illness (U.S. Department of Housing and Urban Development, 2015a), and several studies have found high rates of co-occurring disorders (Fazel et al, 2008;Fazel, Geddes, & Kushel, 2014;Torchalla et al, 2011;Bassuk, Buckner, Perloff, & Bassuk, 1998;North & Smith, 1992). Among homeless mothers, rates of posttraumatic stress disorder (PTSD) range from 22% to 33% (U.S. Department of Housing and Urban Development, 2015b, Bassuk et al, 1998;Hayes, Zonneville, & Bassuk, 2013), while lifetime rates of depression range from 45% to 85% (Bassuk et al, 1996;Bassuk et al, 1998;Weinreb, Buckner, Williams, & Nicholson, 2006;Bassuk & Beardslee, 2014). In one study of homeless families, 63% of mothers had a co-occurring substance use disorder and PTSD, and 85% had both a substance use disorder and depression (Hayes et al, 2013).…”