At the end of 2013, a Beijing-based company did aerial mapping without aerial qualifications and applied for airspace. As a result, a number of civil aviation aircraft of Taiwan were shelved from delays. Four employees of the company were convicted of negligently using dangerous methods to endanger public safety.
In November 2015, a medical helicopter at St. Louis Children's Hospital nearly caused a catastrophe in order to avoid a sharp turn at the oncoming drone.
Massachusetts terrorist attempting to blow up the Pentagon and the U.S. Capitol with a GPS-equipped drone was sentenced to 17 years in prison. South Korea's Cheong Wa Dae, the French Elysee Palace, the Eiffel Tower, the White House, the Japanese Prime Minister's mansion and other places, have been unidentified UAV unauthorized broke.
All this warns us that it is imperative to regulate the flight of unmanned aerial vehicles and that "Anti-UAV" research is imperative!