I've been reading the EMCDDAs European Drug Report: http://www.emcdda.europa.eu/publications/edr/trends-developments/2013

The report clearly states that there aren't any conclusive evidence with regards to drug free TC treatment of opiate addicts:

"Cognitive behavioural interventions have shown some effectiveness with opioid users, but evidence is not sufficiently robust to allow the identification of which intervention is the most effective. There is no conclusive evidence on the effectiveness of drug-free therapeutic communities."

I would very much appreciate some comments on this particular statement in the EMCDDA report.
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Sincerely, Kenneth Arctander Johansen