Shoe bombs are now a known threat. I don’t often hear about threats from “pu36 explosive space modulator’s” either, but once someone tries to use one against an aircraft you can bet we wont allow them, or require that they be tested.
Then why were no planes brought down in the US by shoe bombs before the shoe carnival was made mandatory in August 2006?
Why are no planes being brought down in other countries that don't have a shoe carnival?
And why are you incapable of answering these questions? Does the truth scare the great big "security professional," Ronnie?