what is 3d flat bed scanner?

Answer
it is simply a flatbed scanner that is able to scan in 3D, most scanners will only scan in 2D.
have a look here
http://www.jerrycourvoisier.com/2009/07/capturing-3d-objects-using-a-flatbed-scanner/

Why dont airports use dogs instead of those 3d body scanners?

BillsGold

Dogs could detect everything those scanners do and more. Why not make them standard at every airport gate? My own theory is that you cant make a lot of money from dogs so there's no lobbyists advocating for dogs. You can make money off of those scanners ($150,000 a machine?). Is our security being subverted by washington lobbyists?

Answer
If each team had several dogs all trained in detecting different substances, the handlers could simply walk the dogs along the line of waiting passengers and remove anyone the dogs "hit" on. Forget technology, let nature expose them. I agree. Dogs not scanners.

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