Legality never stopped the USA from spraying radioactive mist (zinc cadmium sulfide) over Medicine Hat, Alberta and a couple other smaller towns not just Canada, but their own citizens too during the Cold War as a funny little experiment to see how radioactive fallout from nukes would move around the environment. Higher than average local birth defects are the legacy of that, which almost everyone is ignorant of.

But yeah the conspiracy that it's widespread and regular behaviour is so fucking goofy.