Comparing outcomes of 'voluntary' and 'quasi-compulsory' treatment of substance dependence in Europe.

AIM This study evaluates quasi-compulsory drug treatment (QCT) arrangements for substance-dependent offenders receiving treatment instead of imprisonment in comparison to voluntary treatment within five European countries. METHODS Participants were interviewed with the European Addiction Severity Index, the ASI-crime module, questions on perception of pressure and self-efficacy, and the Readiness-to-Change Questionnaire at treatment entry and after 6, 12, and 18 months. RESULTS Reductions in substance use and crime as well as improvements in health and social integration were observed in QCT and voluntary treatment groups. After controlling for various factors, subjects in the QCT and the comparison group showed similar reductions in substance use and crime over time. Study retention was comparable in both groups. CONCLUSION QCT is as effective as voluntary treatment provided in the same services in reducing substance use and crime.