Chinese brand DJI Technology Co. has become the leading supplier in the commercial drone market. The Phantom 2 Vision+ drone pictured functions by remote control. Kin Cheung/AP hide caption

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An illustration shows what a helicopter drone would look like on the surface of Mars. NASA/JPL-Caltech hide caption

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Journalist Scott Shane says that the videos and DVDs of the late imam Anwar al-Awlaki (above) continue to inspire terrorist acts. Muhammad ud-Deen/AP hide caption

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A brown bear in its natural habitat. Wildlife ecologists in Minnesota found that black bears in their study experienced an increase in heart rate when buzzed by drones. iStockphoto hide caption

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A helicopter flies near the Lake Fire in California's San Bernardino National Forest on June 19. Firefighters mobilized to combat the wildfire from the air, but they had to be grounded to avoid drones in the area. David McNew/Reuters/Landov hide caption

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A man and his drone: Carlos Casteneda of the Amazon Basin Conservation Association prepares to launch one of his plastic foam planes. Jason Beaubien/NPR hide caption

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It's a drone delivery! This copter is ferrying medicine from a pharmacy to the headquarters of Deutsche Post in Bonn, Germany, part of a test of drone capabilities. Andreas Rentz/Getty Images hide caption

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A drone is displayed Wednesday at Paris store Azur Modelisme. Law enforcement officials in the city are concerned about recent unexplained drone fly-bys of high-security sites, including the Eiffel Tower and the U.S. embassy. Eleanor Beardsley/NPR hide caption

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A staff member from DJI Technology Co. demonstrates a drone in Shenzhen, in southern China's Guangdong province. A new website lets people request that drones stay away from their property. Kin Cheung/AP hide caption

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