Masking the radiation signature

This is what scares me, that the ability to cover up the radiation signature of a nuclear device will outpace the detecting devices designed to locate it.

However, the detecting devices are pretty strong. I heard a story of a person who had implanted a small radioactive device to treat a cancerous thyroid condition, on his way back from Mexico the bus that he was in was pulled over and he was questioned by U.S. agents.

I have also read a new term 'nuclear forensics' a while back (I think in the NY times), that scientist now have the ability to ascertain when (and presumably where) plutonium was enriched. If the story printed is true, the fourth protocol would be less important.

It is interesting that this movie depicted (prior to 9/11) that the governments that agreed to the fourth protocol totally trusted each other in this aspect. Britain did not seem to have any safeguards in place to deter the possiblity of a 'suitcase nuclear bomb'.

Now it is different.