Try the cargo hold of an oil tanker (particularly bothersome, since much oil had NORM, making a nuke hard to detect). Or a truck driving across the Mexican border.
So becasue the methods of delivery you cited are still very real threats, what would this suggest about the effectiveness of efforts being made to date?
"So becasue the methods of delivery you cited are still very real threats, what would this suggest about the effectiveness of efforts being made to date?"
Well, since Saddam has no active nuclear program, being that he is dead and the methods of production (and the uranium produced thereby) are now in our hads, our efforts, so far have been very effective.
Now, on to Iran to finish the job.
Iran, being a state sponsor of terror, can't get much worse, if we allow it to fall into chaos.
Ergo, we can just blow means of production up and not worry about occupation.