A report by the Center for the Study of the Drone found that there were 921 incidents involving drones and manned aircraft between December 2013 and September 2015. Bruce Bennett/Getty Images hide caption

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The Secret Service released this photo of a "quad copter" that crashed on the White House grounds Monday. The agency says the copter's operator reported crashing it this morning. Secret Service hide caption

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The Secret Service released this photo of a "quad copter" that crashed on the White House grounds Monday. The agency says the copter's operator reported crashing it this morning. Secret Service hide caption

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Where Can Drones Fly? Legal Limits Are Up In the Air

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On Friday in Peshawar, Pakistan, supporters of Jamaat-e-Islami party shout slogans during a rally to condemn U.S. drone strikes. Ahmad Sidique/Xinhua /Landov hide caption

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