Larry Nassar, a doctor who treated female gymnasts and is accused by many of molesting them, pleaded guilty to child pornography charges on Tuesday. Michigan Attorney General's Office/AP hide caption
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This photo provided by the Centre County Correctional Facility shows Jeffrey Sandusky, who was charged Monday with sexual offenses involving children. Sandusky is a son of former Penn State assistant coach Jerry Sandusky. AP hide caption
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The website Backpage has removed adult advertisements. A Senate report last year accused the website of being a forum for child sex trafficking. Backpage/Screenshot by NPR hide caption
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Former Subway pitchman Jared Fogle arrives at a federal courthouse in Indianapolis on Thursday to be sentenced on charges of trading child pornography and paying to have sex with minors. Michael Conroy/AP hide caption
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Using Tor, or The Onion Router, enables users to hide their online activities. Advocates say the network protects the privacy of activists. But prosecutors say it's used extensively by criminals — and is making it harder for law enforcement to do its job. Daniel Acker/Bloomberg via Getty Images hide caption