Fans who hear the whirring sound of a drone over a stadium might see it as a nuisance but law enforcement has long viewed those aircraft as a potential weapon of mass destruction. With the World Cup about to kick off, security is heightened and there’s a zero-tolerance policy for drones over or near stadiums during the 78 matches in 11 U.S. cities. Authorities have ratcheted up counter-drone measures used at the Super Bowl and other major events, while Congress has given law enforcement broader