This "20/20" story original aired on March 7. Tune in Friday, July 18 for John Stossel's special hour on "Sex in America."
Twelve years ago, Frank Rodriguez pleaded guilty to sexually assaulting a child.
Faced with two to 20 years in prison on the charge, he signed a plea bargain that gave him seven years probation. He was told he must never be near children. That meant he couldn't be any place where children gather, like playgrounds or parks, which made it tough to find work.