In response to horrific sex crimes against children, Congress and the states have passed hundreds of new laws in recent years to crack down on offenders. In addition to much longer sentences and more rigorous tracking of sex criminals upon release, some of the new laws place limits on where offenders can live, banning them from neighborhoods surrounding schools, parks and playgrounds. But critics warn the laws may prove counterproductive, driving sex offenders further underground. They also point out that most perpetrators are family members or other acquaintances of victims, so the new laws may shift resources away from treatment programs that could help more. Moreover, experts note sex offenders' low recidivism rates and a dramatic drop in child sexual-abuse cases. But with the media giving heavy coverage to the worst cases of abduction and abuse, it's no wonder that lawmakers are willing to approve any punishment or tracking technique that promises to prevent crimes against children.