An evaluation of 21 sex offender prison-and non-prison-based treatment programs was undertaken using the format of the University of Maryland’s 1997 report to the U.S. Congress. Eight of the studies were deemed too low in scientific merit to include in assessing the effectiveness of the treatment. Of the remaining studies, approximately 50% showed statistically significant findings in favor of sex offender treatment programs. Of six studies that showed a positive treatment effect, four incorporated a cognitive-behavioral approach. Non-prison-based sex offender treatment programs were deemed to be effective in curtailing future criminal activity. Prison-based treatment programs were judged to be promising, but the evidence is not strong enough to support a conclusion that such programs are effective. Too few studies focused on particular types of sex offenders to permit any type of conclusions about the effectiveness of programs for different sex offender typologies.
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