Why is this laughable? There are stories of kids and women being used as suicide bombers.
The comment above makes the dreaded profiling word seem like a dirty thing, it should be a perfectly acceptable thing. Follow Israel's lead and behavior profile people as soon as they step into the airport and flag them appropriately.
Why is "be like Israel" the be all end all solution? Profiling does not scale to the 800 million US travelers. Who are we profiling for? Arabs? Don't forget the 2nd largest terrorist attack on US soil was committed by a white Gulf War veteran who was raised Christan.