“…In reviewing treatment outcomes in substance abuse treatment, previous studies have investigated many variables that interact with treatment to predict outcomes in substance abuse that include drug of choice (Nazar et al, 2009), client motivation (McCollum et al, 2003;Hayes et al, 2010), prior treatment history (Wright & Devine, 2015), and severity of psychiatric symptoms (Compton, Cottler, Jacobs, Ben-Abdallah, &Spitznagel, 2003).…”