There is no evidence that the weapons-grade plutonium has been stolen or diverted for illegal purposes
Well what on earth would anyone want it for other than illegal purposes?
Snip: Uses: bombs, nuclear reactors
Snip: The Los Angeles Times[2] says that one ten-thousandth of a gram (0.1 milligram) inhaled can cause cancer. This is correct: we have already estimated that 0.08 milligrams inhaled will have 100% probability of causing a fatal cancer. To inhale 0.1 milligram of plutonium, however, a person would have to inhale more than seven hundred thousand particles. (A single 0.1-milligram particle would have a diameter of over 260 micrometers, about 90 times too big to be readily inhaled.) Although a single respirable particle is unlikely to harm an individual,[13] there is still cause for concern if plutonium were to be dispersed in the atmosphere.