Cell towers are constantly tracking the location of mobile phones. And that data, federal courts have ruled, is not constitutionally protected. Steve Greer/iStockphoto.com hide caption

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Who Has The Right To Know Where Your Phone Has Been?
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News of U.S. surveillance in Europe has met with distrust and anger; officials are heading to Washington to discuss matters next week. Here, members of an artists' group paint a mural called "Surveillance of the Fittest" on a wall in Cologne, Germany, on Thursday. Frank Augstein/AP hide caption

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German Chancellor Angela Merkel (right) talks with Italian Prime Minister Enrico Letta on the second day of an European Council meeting in Brussels on Friday. John Thys/AFP/Getty Images hide caption

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A sign outside the National Security Agency campus in Fort Meade, Md. Patrick Semansky/AP hide caption

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You Have Questions About The NSA; We Have Answers
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Report: NSA Harvests Contact Lists From Email, Facebook
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