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Skeletal Identification
Bruce Schneier noted a story today over at his blog about a new Skeletal Identification System being developed at Wright State. Of course this is just another biometric detection system, but one that would be pretty tough to disguise.
I imagine there may be some issues with irradiating people to identify them. This isn't something on the surface you can just get with backscatter terahertz. Imaging bones means X-ray, and a fair bit of it for a full-body image. They might be able to get it down to the equivilent exposure of one plane flight - but add up all the airports, ports, theme parks and places adults may encouter children each year. That's a potential legal risk, if nothing else.
On the other hand, if someone suggested imposing manditory x-ray exposure as a means to identify pedophiles, most people would probably suggest positive results be given an extra-high-intensity scan just to confirm it with a clearer image.
Oh come on. This is easier to avoid than using glitter to fool mass face recognition.
That is, to have much value, working "at 50 meters," this is a mass detection system. You have to analyze hundreds if not thousands of targets, to known profiles. How do you fool it? Calcium is cheap, real cheap.