[citation][nom]jellico[/nom]I believe/agree with you. These systems work by taking measurements of things like the distance between your eyes, between your ears, distance from your eye corners to the bottom of your nose, etc. It then creates tables of ratios to form a sort of biometric hash of your face (obviously with fuzzy logic to account for things like wearing glasses, growing/removing facial hair, etc.). To defeat such a system, you simply need a facial appliance, as alidan suggested, that would alter these features thereby creating a false "hash" for the wearer. With practice, you could become skilled enough at applying them that they would look as good as anything produced by Hollywood. Granted, a human being might think you look a little odd (at a subconscious level, we expect faces to look a certain way and we are keenly aware of even minute deviations), but it would more than enough to defeat even billion dollar facial recognition systems.[/citation]
At the same time you would think they could build countermeasures into certain selected locations, such as passport control or border control, The night vision and thermal vision capabilities on the latest CCTV cameras makes disguise nearly impossible. Makeup and prosthetics help to hide bone structure, but thermal filters on the cameras are actually able to see the heat of blood flow through facial arteries, which act as a face fingerprint
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OK this is expensive kit so it won't be on street corners just yet, but you only have to have them in a areas of high traffic, such as airports or train stations and you could pick out Drew Barrymore disguised as LL Cool J before you could say "Charlies Angels"
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Anyone with a rubber face on walking through passort control will be kindly asked to remove it, and low and behold it's another Allahakbar trying to blow up some more skyscrapers, bingo, 1-0 to the good guys, shame the system only cost $1billion and all your civil liberties