Scanners can't distinguish between sweat and explosives
In Germany, officials announced the machines and the software are currently too unreliable to be used."
"Local press reports put the false alarm rate high as 49 percent and said sweaty armpits had been the culprit multiple times."
Our comment: The scanner gives a false alarm for sweat, but a real gun goes through unnoticed. See this story:
NBC DFW: Armed Agent Slips Past DFW Body Scanner
Our comment: TSA spent over $170,000 each for scanners that can't detect guns as well as a $ 1,200 metal detecting archway.