Sure, it is possible that a dirty bomb could be exploded in the US. It could be transported here on a container ship to any port city with little chance of detection - or could it?

There are so many safeguards in place now that the public does not know of that chances are greatly diminished.

There have been tries but no known successful attempts to smuggle a dirty bomb here.

Remember, we have to catch all but they just have to get through once.

Do not put down our guards of the ports. These guys are good!