“…Because a range of 'secondary' problems, such as physical or mental illness, unemployment, and homelessness, contribute to the progression of addictive disorders, substance abuse treatment programs may also make available comprehensive or 'wrap-around' services to address 'secondary' problems (Institute of Medicine, 1990;Moos & Finney, 1995). These problems may cause distress and trigger relapse even among persons who successfully reduce their substance use (Friedmann, Saitz, & Samet, 1998;McLellan & Weisner, 1996), and delivery of comprehensive services to address these issues has been shown to improve functioning, treatment retention, and outcomes (McLellan, Arndt, Metzger, Woody, & O'Brien, 1993;McLellan, Grisson, et al, 1993;McLellan & Weisner, 1996;McLellan et al, 1998). Despite their importance to quality substance abuse treatment (Leshner, 1999;Leukefeld, Pickens, & Schuster, 1992), the availability of comprehensive services declined from 1980to 1990(D'Aunno & Vaughn, 1995Etheridge, Craddock, Dunteman, & Hubbard, 1995;McLellan & Weisner, 1996;Widman, Platt, Lidz, Mathis, & Metzger, 1997).…”