60 Minutes has learned the U.S. Army is routinely using lasers to shoot down drones operated by drug cartels along the U.S.-Mexico border. Smugglers use drones to move drugs and money across the border. Wahid Nawabi, CEO of the anti-drone laser contractor AeroVironment, points out that transport drones are easier than digging a tunnel and then moving contraband underground. #usborder #mexicoborder #cartel