The young aspiring engineer built and tested a pistol gun mounted to a multi-rotor drone and showed it firing off several rounds on its own, with the trigger being pulled remotely. Although the father claims to have been in supervision mode, the son researched the project beforehand and could not find any laws that he could be breaking, hence, he continued with a live test.
I don't like furthering interest by adding the YouTube video to view, but maybe viewing it will outrage the masses enough to get our politicians and lawmakers involved to enact specific federal laws around drones, before a real live gun (or worse) drone catastrophe happens.
In these chaotic times, it seems like we need more aspiring inventors coming up with game changing ideas that will make our world a better place...and not ones that come up with bad ideas that inspire the troubled, crazy or evil with unlimited nefarious possibilities...