[Lessismore]

Given that these devices cost $4M each, wouldn't an effective ploy for the terrorist to be to pack a container with explosives and a radiation detector detonator?

The container would go into the X-Ray machine, trigger, and destroy the machine.

Not only would the machine be destroyed, but it would increase the pressure to scan all containers, thereby stifling trade.

[Ernest_at_the_Beach]

Hmm!

[Travis McGee]

Every day I sincerely thank God that our enemies are such unimaginative dullards. 9-11 was an aberration: if they were clever, they could be pulling ops of similar magnitude on a monthly basis. Including shutting down our aviation, transportation and postal systems for starters.