The theory is that the image the scanner takes is of the front and back of the terrorist. The terrorist simply puts his box cutters in a secret pocket on the side of his shirt. And when the photo is taken the box cutters appear black, but since the background also appears black, the box cutters are invisible.
It would seem that if the TSA isn't doing it already, they'll take four images: front, back and both sides. Or maybe not. More here.
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