but yes theoreticaly terrorist could hijack the nuclear waste truck and dump it infront of a school or something. the fact that they didn't yet leads me to belive that there are defenses in place or that that wouldn't be as effective as we think.
Although I'm sure the defenses are in place for such things, one has to realize that the government has no interest in telling the population if such a thing happens. Because such things are nearly undetectable even after they happen means that in order to keep everyone from going crazy, they would keep it secret.
What happened to the fallout area from the Trinity testing site? The Downwinders weren't told, and in 3-mile island, they decided that anything that would get into the atmosphere would blow off into the ocean by the wind patterns...
I'm not suggesting that it happens all the time, I'm just saying that if you know what the government does in such cases, you as an individual can take the precautions necessary to insure that you are not victimized by such incompetent secrecy.
Of course, in your example, the proper course of action is to not eat the dirt in and around those locations, which is easy. But what if you have to not breathe the air, or not drink the water, it gets harder, and there are plenty of hazardous materials that are not radioactive, and undetectable to anyone who isn't using the latest sensing equipment to look...
I'm only pointing out the complexities of such situations, and not suggesting that you should actually be worried.
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One could say that when Kennedy said "
we will go to the Moon, and do the other thing, not because they are easy, but because they are hard" that certain people in power were scared by the words "
And do the other things" as they might have referenced reforms unacceptable by such third parties, and that this could be blamed for the results, but that's just plain silly...
My point is to know people, how they act, their motivations, etc, and to know yourself, and that is your best defense for such things... ...but to be careful when filling in the details with whatever sand and spit one can think of...