Apple, which unveiled iOS 8 at June's Worldwide Developers Conference, says it will be technologically unfeasible for police to extract data from its new operating system. Justin Sullivan/Getty Images hide caption

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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

itoggle caption Steve Greer/iStockphoto.com

A college student spent the night in jail and was charged with felony counts after agents approached her car, suspecting she bought beer at this Harris Teeter grocery store in Charlottesville, Va. Google hide caption

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