The introduction of the scanners is a response to the failed 2009 Christmas Day underwear bombing attack on a US airline involving a passenger trying to detonate chemicals hidden in his underwear and in a syringe.Soooo, three years later, we're going to start foiling the potential underwear bombers.
Yep, hundreds of millions of dollars to prevent something that happened once, hasn't happened in the intervening years, and was (is), apparently, a matter of urgency - to protect our country.
Good to know they're onto it. Good to know our money is spent so rationally.
Scanners at airports to reveal all