Parents like Julie Roach would like to think they do, but more often than not, dangerous sex offenders are falling through the cracks.
"That's really worrisome as a parent," Roach says. "I certainly don't want to know that there's people out there that can't be kept track of."
By law, a sex offender is required to tell police where they live. But last year, roughly 50 sex offenders in Benton and Franklin Counties changed addresses without telling authorities -- meaning some of them could move into your neighborhood without you knowing it.
"It makes you think a lot more about keeping your kids supervised," Roach says.
In the last three years, the number of non-compliant sex offenders has doubled in the Tri-Cities. As a result, police beefed-up communication... And turned to the community for help. That vigilance has gone a long way at hauling criminals to justice. Of the dozens of non-compliant sex offenders last year, police eventually caught and arrested all of them.