“…The two treatment programs that were the focus of this study contain most of the treatment components that researchers have found to be effective interventions in community-based substance abuse programs for offenders (Harland, 1996;74 JOURNAL OF OFFENDER REHABILITATION l Haddock, 1992). For quite some time, the literature has suggested that an optimal length of treatment for addicted offenders is somewhere in the range of 18 months (Martin, Butzin, & Inciardi, 1995;Wexler, 1995;Hooper, Lockwood, & Inciardi, 1993;Martin & Inciardi, 1993;Inciardi et al, 1992;Lipton, 1989;McClellan et al, 1981).…”