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I don't have access to this journal - maybe someone else on the list does? - but it sounds like an interesting study (if a little old now): Ohio's Prison-Based Therapeutic Community Treatment Programs for Substance Abusers Preliminary Analysis of Re-Arrest Data Authors: Harvey A. Siegal abc; Jichuan Wang bd; Robert G. Carlson be; Ruumlssel S. Falck b; Ahmmed M. Rahman fg;Robert L. Fine hi (Show Biographies) Published in: journal Journal of Offender Rehabilitation, Volume 28, Issue 3 & 4 March 1999 , pages 33 - 48 Subjects: Conflict Resolution; Security Studies - Pol & Intl Relns; Violent Crime; Abstract This study evaluates the Ohio Department of Alcohol and Drug Addiction Services' prison-based therapeutic communities (TCs) for inmates with histories of drug abuse. The study compares arrests/charges following release from prison among 487 inmates with TC experience and 242 inmates without TC treatment. Outcome measures were based on arrest and charge statistics. The results of survival analysis and Cox hazards model analysis indicate that length of time in the TC is crucial to a positive outcome. Controlling for age, gender, ethnicity, and education, inmates who spent at least 180 days in a TC were significantly less likely than those with less time in treatment or no TC exposure to be re-arrested/charged with violent or drug-related crimes one year after release. Keywords: Prison-based therapeutic communities; drug addiction; evaluation Rowdy Yates Senior Research Fellow Scottish Addiction Studies Dept. of Applied Social Science University of Stirling Scotland T: +44 (0) 1786-467737 F: +44 (0) 1786-466299 W: http://www.dass.stir.ac.uk/sections/showsection.php?id=4 (home) W: http://www.drugslibrary.stir.ac.uk/ (online library) -- The Sunday Times Scottish University of the Year 2009/2010 The University of Stirling is a charity registered in Scotland, number SC 011159.