The procedural aspects of this sound good - multiple rings of security, compartmentalization of risk, etc. - but I have to wonder how well systems so dependent on the intelligence and intuition of individual screeners would work in North America.
[edit: I'd love to know what percentage of Muslims are subjected to "Selective Screening" on El Al flights. The TSA/United States can't get away with the same type of behavior that Israel can get away with. We have to treat everyone the same to avoid the taint of "Profiling"]
The TSA operating procedure manual specifies that ALL citizens of 12 countries (almost exclusively Muslim-populated ones) are automatically selected for secondary screening.
Even my American citizen friends with Arabic names get "random screening" the majority of times they fly.