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Originally Posted by scaeagles
Right now there are machines being installed (or that have been installed - I am not sure of the time line) that scan ports and ships for radiation signatures common to nuclear weapons.
There is monitoring of terrorist "chatter".
And there are probably hundreds of other things going on that I have no idea about.
The interesting thing about the gathering of intelligence and successes in the intelligence world is that revealing successes will often lead to revealing the methods employed in those successes, therefore rendering those methods less successful.
There is no fool proof method, however. It is an ongoing tricky process that cannot be relaxed. It is only a matter of time until the next attack (nuke, dirty bomb, or otherwise) that will leave the press and the populace screaming "why weren't we doing more to prevent it?!?!".
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And how much does all this cost, compared to the cost of -say- occupying Iraq? The measures you listed are indeed akin to the traffic lights and stop signs of the motoring world. They are reasonable, and
reasonably priced preventive methods. Would you find a cop on every corner in America a reasonable method of preventing traffic accidents? Or would that be excessive and wasteful?