[carl in alaska]

An even better answer is this: I believe we're just talking about sealed shipping containers here that the screeners do not open and inspect. They just scan the sealed containers. So the screeners would have no idea what kind of shielding is being used to shield nuclear material. Customs could just seize a sealed container and the screeners would have no idea why it was seized. They would probably be thinking..."must be drugs in there."

If we seize an open contaner after it's inspected, then we would need to do that out of view of foreign workers.

[singfreedom]

My guess is, if an entire container or a large portion thereof is shielded, the container would be seized. I'm sure that is standard op if containers are being scanned. I know that's the case in airports. If screeners can't determine what an object is, they search the entire suitcase.