A report published by the DoD Inspector General revealed that military drones have been used for Non-Military domestic Surveillance. A report issued by the Inspector General at US DoD states the that less than 20 missions have been flown by military spy drones on non-military missions between 2006 and 2015. The news was revealed by the USA Today that obtained it with a Freedom of Information Act request. The report states the drones may not conduct surveillance on U.S. persons and bans the use of armed drones over the United States.”]
Source: https://securityaffairs.co/wordpress/45248/intelligence/us-drones-domestic-surveillance.html