Yes, this system is controversial. What that means is that the system that actually gets put into place will be far less extreme. It also sounds like this has some basis in that failed national security catalogue that the Pentagon (or the CIA, can't remember off hand) was planning to compile, but without that I can't see how efficient this system would be. By due process of law and the constitutionality of such a system, it would have to be slanted towards letting people through rather than holding them. I can see a lot of folks getting thrown into "yellow," which just takes the random out of random screenings, but "red" I would think would take something like being wanted for a serious crime or being on the terrorist watch list. Note the wanted, being convicted and serving time for a serious crime would not set off the alarm.
And we have once again successfully entered that grey realm of International politics, with the US isn't under a "law" thing. A debate I'm not eager to see again and again. First off, the US government does act in the interest of its own citizens first and foremost, as it should. It does this on a national level, through social programs, laws, and security, and it does this internationally through diplomacy and war. So the sanctions on Iraq, which is a favorite soft spot for anti-american sentiment, were not the best idea in the long run. Then again, they were under UN mandate (yes, I know US political pressure led to the enactment of the sanctions but they were also approved, no matter how grudgingly, by at least the 8 other members of the Security Council). And it's not like we could just lift the sanctions while Saddam was in power, as that can be seen as a concession and can lead to far worse problems. (Watch 13 days, a similar example for those of you who remember the cold war) Saddam did, after all, try to build a cannon capable of shelling the US as its explicit purpose, so no matter how much anyone argues otherwise he was rightly a percieved threat. And for the record equating flying an airliner into a 100 story office building with the relatively few civilian casualties caused by a war is some very f****d up reasoning.
And too, while I'm on the subject, I grow VERY tired of the anti-American sentiments that are so often vocally expressed on this forum. I would have you know that I am a civicly responsible citizen of the United States. I believe that our government, despite its flaws, is one of the best in the world. I support my nation's soldiers and I support my nation's leaders, even if I do not wholeheartedly agree with them on several major issues. I don't support the US-led war in Iraq as it was sold to the world (while I do see it as ultimately being a good thing for the Iraqi people, and it would have been even more so if the military brass had done better planning for post-war Iraq), but now that we are there I believe that we should stay there until the situation is stabalized. Leaving now would be irresponsible both the to the lives lost in the war and to the citizens of both countries. Take that as you will, those are my stances and they are not going anywere.