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MADISON, Wis. - Eric Szatkowski is a Wisconsin Justice Department special agent, but on that Sunday afternoon he entered an online chat room as a 14-year-old boy.

He claimed he was into weightlifting, AC/DC and muscle magazines. Then he waited.

Within hours, screen name Paul2u sent a message: "Hi. u realy 14?"

Over the past decade, agents and computer experts have gone after hundreds of people like Paul2u who solicit sex from kids or trade child pornography online. Police efforts around the country were all the rage with the media in the early 2000s, reaching a crescendo with Dateline NBC's "To Catch A Predator" series.

Despite the publicity then and now, the bad guys haven't gone away. They've quietly multiplied. Trading child porn online and grooming underage targets in chat rooms has exploded nationwide. With arrests more than quadrupling in 10 years, Wisconsin's agents and analysts feel overwhelmed.

"I don't think we've made significant progress at all," Wisconsin Attorney General J.B. Van Hollen said. "Our community leaders don't even know how bad the problem is. The general population has no idea."