Sex offender registries are set up to provide notice and protection for the community. But, what happens when the public uses that information to take the law into their own hands? That was the case last year, when a man killed two registered sex offenders in Maine, according to police. A sex offender's name, address, and employment can be found on a registry, which may leave that person vulnerable to harassment and in some cases assault. So, what laws, if any, are in place to protect sex offenders from vigilante crimes? Lawmen tell us if a crime is committed against someone who is on the sex offender registry, it would be prosecuted as if they weren't on the sex offender registry.