Joseph Belanger developed his dangerous obsession while working as a psychologist treating sex offenders in a state mental hospital in Jamestown, North Dakota. After more than 20 years working at the hospital, Belanger admitted that he was under federal investigation for downloading hundreds of pornographic videos and images of children. The allegations immediately called into question his testimony as a witness in court cases involving the commitment of sex offenders.

In January, Belanger was sentenced to seven years in prison, and U.S. Bureau of Prison records show he's serving his time at the minimum security federal pen in Lompoc, California. Yet Belanger's case continues to ripple. Two cases of sex offender commitments in Iowa were overturned as a result of Belanger's tainted testimony - one of those offenders was committed last week after a second trial.

Belanger also had been licensed to practice psychology in Minnesota since 2006. Earlier this month, he agreed that his misconduct required the revocation of his license and any future attempt to get it back in a consent order with the Minnesota Board of Psychology, the state agency that enforces rules and regulations of psychology. It's a rare sanction - the psychology board's disciplinary records show only 26 other license revocations since 1981. Three of those practitioners got their licenses back.