“…Similarly, support has been found for the effectiveness of intensive prison treatment integrated with aftercare for those with more severe crime and drug histories and poorer education and employment backgrounds. Nevertheless, several authors have suggested that selection bias may be influencing these outcomes (Nemes, Wish, Wraight, & Messina, 2002;Pelissier et al, 1998;Pelissier et al, 2000;Pelissier et al, 2001;Wexler et al, 1999b), indicating a need for either better controlled studies or analytic strategies that take selection bias and other threats to validity into account.The modified TC prison and aftercare programs (described fully by Sacks, Sacks, & Stommel, 2003b) examined in this paper evolved from three sources. First is the body of work produced by De Leon and colleagues, which provides a full description of the TC for the addictions, the conceptual framework, program model, and treatment interventions (De Leon, 1984, 1989, 1996 De Leon & Jainchill, 1981-82, 1992De Leon, Skodol, & Rosenthal, 1973;De Leon et al, 1982).…”