“…This is because the programmed consequences do not correspond directly to each individual's behavior, and individuals who have recently used drugs may receive reinforcement. Somewhat paradoxically, research in areas other than drug abuse has repeatedly demonstrated that dependent and interdependent group CM interventions are better than no contingencies and are at least equal and often superior to individual CM in producing positive change in the target behavior (Brown & Redmon, 1990;Kelshaw-Levering, Sterling-Turner, Henry, & Skinner, 2000;Lew, Mesch, Johnson, & Johnson, 1986;Lloyd, Eberhardt, & Drake, 1996;Mawhinney & Fellows-Kubert, 1999;Pedalino & Gamboa, 1974;Popkin & Skinner, 2003;Shapiro & Goldberg, 1990;Speltz, Shimamura, & McReynolds, 1982;Theodore, Bray, Kehle, & Jenson, 2001;Turco & Elliott, 1990). One possible reason may be the emergence of corollary or nontargeted cooperative and supportive behaviors, which have been noted in group CM studies conducted with children and adults in a variety of settings (Gresham & Gresham, 1982;Hayes, 1976;Williamson, Williamson, Watkins, & Hughes, 1992).…”