Thousands of convicted sex offenders are evading state and federal authorities, congregating in regions thought to have lax enforcement, slipping back and forth to Mexico or disregarding laws on reporting their whereabouts. As states and federal authorities stitch together a national system for overseeing America’s 700,000 convicted sex offenders, they face a sobering challenge: Locating the estimated 100,000 sex offenders who aren’t saying where they are.

State and local authorities, working with the U.S. Marshals Service, are conducting sex offender sweeps, checking old addresses and hunting down the absconds. Often times, officials say, the offenders are where they have been along — they’ve just fallen behind on paperwork. But sometimes not.

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http://www.scrippsnews.com/content/thousands-fugitive-sex-offenders-evade-us-authorities