“…Substance use problems are prevalent among homeless youth with an estimated 70-95% of youth reporting substance use (Booth & Zhang, 1997; Chen et al, 2006; Martijn & Sharpe, 2006) and 69-71% meeting criteria for a substance use disorder (Baer, Ginzler, & Peterson, 2003; Kipke, Montgomery, Simon, & Iverson, 1997). The relationship between substance use and homelessness is somewhat unclear.…”