Evaluating component effects of a prison-based treatment continuum.

A continuum of correctional-based therapeutic community (TC) treatment programs for drug-involved offenders has been functioning for several years in Delaware. Previous evaluations have shown the efficacy of the full continuum for up to three years posttreatment, though there has been some question of the benefits of treatment within prison. The particular focus here is on the relative impact of the within-prison, transitional, and aftercare treatment components upon criminal recidivism and relapse to illicit drug use. The relative benefit of participation in each component is supported, over and above the effects of differences in demographics and histories of criminal behavior and illicit substance use. However, the residential transitional program effects are generally larger and more long lasting. Additionally, the two outcomes appear differentially sensitive to the degree of completion of the continuum.