The Nude-O-Scopes do not detect explosives, and they are easily defeated by simply placing contraband under folds of flesh or in body cavities. Even the Government Accountability Office stated that a Nude-O-Scope would probably not have caught the underpants bomber.
Only three things are needed:
- X-ray
- Metal detectors
- Explosive trace detection/portals
If you notice, the words I used were "deterrent". I did not say it would be our savior and discover any and all possible means of causing harm on an airplane.
Any detection technology can be defeated. Any amount of security, a hole can be found. As has been said many a time, It is nearly impossible to stop a single crazed zealot who is not afraid to sacrifice themselves in the name of their cause. The same laws and constitution which protect our freedoms, also protect the freedoms of those who wish to do harm, so it's a delicate balancing act between protecting those freedoms and locating those who wish to do us harm. Personally.... i feel the fear and paranoia in this country allowed too much freedom and privacy to be given up in the name of "protecting us", but that is a much larger discussion for another time.
IMHO the name of the game here at the the airport security screening is deterring those who wish to cause harm, and not so much catching them. Some rules are just plain ridiculous (shoes? 3oz of liquid? seriously?? And for that matter... since I smoke I can bring a lighter, but god forbid I want to bring a coke thru to drink while waiting on my flight.), but at the same time, since you may never know exactly what you may end up running into thru security, if you were wanting to blow things up or attack someone, you would need to prepare to get thru anything they may put you thru during the screening process. If you are determined to do it, you can find something that would be able to get thru the system.... but if you prepared to beat anything they could throw at you, your options would be a lot more limited.
And then there is the placebo effect. As was said in Men in Black. A person is smart. People are stupid. It's amazing how many people believe everything they do is making things safer so we won't have to deal with anything ever again. That makes those people more relaxed, and more likely to enjoy their trip or go on one in the first place. So think of these items as a sugar pill. the occasional Sugar Pill isn't necessarily bad for you, but if you take a lot of them it could start to cause problems. For the casual flyer, it's the same thing. The occasional inconvenience or extra tiny dose of radiation isn't gonna be too big an issue.... but for the frequent flyer it could be a much more serious problem.
(Which... that brings us back to knowing your audience. flyertalk members may actually have a much more legitimate reason to gripe about these scanners than those on a board like DIS who may fly 2 or 3 times a year. Disney which may have people fly in once a year for a vacation is going to have less reason to complain for their clientele than frequent flyer groups and/or larger city Chambers of Commerce might because of the impact on their business travelers and frequent flyers.)