Man arrested over drone at Japanese prime minister's office - US News
It was a Japanese National that did it in protest of the governments nuclear energy policy.
A person could misuse it and this has happened in many cases and it is a good thing no one was inured and using a radioactive one was dangerous as well as it could of caused harm. The guy may have had a right cause but, using a drone with radioactive material was not the right way to go and could of done a peaceful protest. I think so, we will have to see what happens and hope the guy does not get into too much trouble and wander what will happen to him now.