http://www.thelocal.de/sci-tech/20101116-31209.html
The units, which have been in use since September, are apparently unable to tell the difference between foreign objects and such things like pleated clothing.
The scanners use millimetre-wave technology to produce outline images of bodies, with each scan lasting less than three seconds.
While some passengers are being asked to remove thicker clothes such as jumpers, NDR reported that the devices are regularly malfunctioning due to creases in lighter clothes such as blouses and skirts.
Rafi Sela, an Israeli airport security expert who helped design security at Ben Gurion International Airport, has said:[82] “I don’t know why everybody is running to buy these expensive and useless machines. I can overcome the body scanners with enough explosives to bring down a Boeing 747...That’s why we haven’t put them in our airport”