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Re:When we got to the scanner, I opted out. Then they opted ... by kgermino on Tuesday November 16, 2010 @04:09PM (#1911673)
They use the back of he hand on more private areas so that the fingers are facing outwards. The idea is to prevent any kind of grabbing: perceived, actual, accidental, intentional, whatever.

Edit: iPod typos

Re:When we got to the scanner, I opted out. Then they opted ... by joshes on Tuesday November 16, 2010 @07:05PM (#1912304)
I always thought that it was because the palm of the hand was more sensitive than the back, but the finger theory is much more sensible.