It's now possible to own a drone - often for less than $300 - and a growing number of people are purchasing the flying machines to play games, record video, and perform stunts. But the rise of personal drones worries civil liberties experts, who say they can be used for spying or mayhem, as well. "Drones make it possible to invade privacy without even trespassing," said Amie Stepanovich, a surveillance expert at the Electronic Privacy Information Center. "This is a real concern."

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