Personally, I believe that they are taking from other agencies what they believe is the best practices and leave the chaff on the side.
See, there ya go again. "Chaff". As if America somehow has SO much more terrorist experience than the rest of the world. ONE event. ONE. Have you any idea how many times terrorist have struck in other parts of the world? Yet, once again America has decided to lecture to the world, to consider the product of DECADES of experience as "chaff". And that's why no one will ever teach TSA anything.