Source: (2005) Ottowa: Correctional Services of Canada.

Further, a considerable harm reduction function has been noted in the COSA sample, in that sexual reoffenses in this group were categorically less severe than prior offenses by the same individual. This function was not observed in the matched comparison group. Overall, COSA participants have been responsible for considerably less sexual, violent, and general offending in comparison to their matched compatriots, ultimately contributing to savings both financially and, more importantly, in regard to human suffering. (excerpt)