This made me think of think of a recent wired article
http://www.wired.com/magazine/2011/10/ff_radioactivecargo/all/1
TL;DR The dirty bomb scanners at the port of Naples went ape shit over a container from Saudi Arabia. Turns out it was a container of scrap metal that an old radioactive element from a medical scanner had found its way into. Good times.
The apocryphal story is that of my old boss. When he started with my old employer (a medical testing lab) he was in the x-ray lab, and as such had to wear a radiation badge. After a while he began forgetting to take the badge off when he left for the day, and his walk home (always the same route) tended to take him past a couple of the busier streets. No big deal, since he'd just swap out his badge in the morning before starting a new shift. One morning he comes in and the lab is shut down, and everyone has their serious faces on.
Turns out the badge he'd turned in from the day before had come back as hot. Not the "bad badge" type of hot, but the "you were definitely exposed to a pretty solid dose of radiation" type of hot. Per protocol everything had to be shut down, tested, procedures reviewed, yadda yadda. In the end, everything in the lab tested fine, and his was the only bad badge found. Best guess was that a truck that went past him on his walk home that day was (knowingly or unknowingly) carrying something nasty.
There's a lot of pretty foul stuff out there. The boy scout who build his breeder reactor a few years ago used radium paint that he found when his gieger counter tripped when driving past an antiques store. One of the post Fukushima radioactivity scares in Tokyo was caused by stored bottles of radium paint that had been forgotten decades ago. We'll probably see more stories like this, and I don't feel that's a bad thing. When it comes to stuff like this, stuff that causes cancer (actually causes cancer. Not like Cell Phones or wifi.), fuck your civil liberties. Public health & safety wins, even if its getting bought in the name of fighting "the terrrrrer"