[travisoneill1]

Polonium is actually very stealthy. It's an alpha emitter which is not detectable by most equipment, and it was very nearly not detected even by the UK government. https://en.wikipedia.org/wiki/Poisoning_of_Alexander_Litvine...

[tyingq]

Well, yes and no. Like "The traces were found in passenger jets[44][45] BA875 and BA873 from Moscow to Heathrow"