Assessing the long-term behavioral effects of sex offender treatment was undertaken by interviewing a total of 70 sex offenders. A structured interview process was used, along with pre- and post-testing for 5 time periods. Participants were asked to indicate their ability and confidence on 10 variables regarding risks of offending at 6 months, 1, 2, 3, and 4 years post-treatment. Trends indicate overall improvement and increased ability to maintain a new life-style free from offending behavior. These self-report data corresponded with results on the Tennessee Self Concept Scale, the BEM Sex Role Inventory and the Derogatis Sexual Functioning Inventory. Four years after treatment, participants reported total confidence for not reoffending. They stated that they felt they had control over their sexual misconduct even though their sexual urges still remained a problem. Most felt less need to use their maintenance plan, although they used it when needed.