BTW, if by Al Qaeda “changing tactics” you are referring to the story this past month about the CIA double-agent in Yemen, that story has all the hallmarks of the usual Pentagon/E-Ring propaganda machine.  If referring to the “underwear bomber” of a few years ago, you should be aware that Umar Farouk al Mutallab was allowed to circumvent all the usual security measures at the Amsterdam airport to perpetrate his crime after being brought to the airline ticket counter by what eyewitness Kurt Haskell described as a “sharp-dressed Indian businessman” and allowed to board the plane with no passport, using a ticket bought by a never-identified third party using cash.  The airport even had body scanners and the bomber was allowed on the plane without ever once being sent through them.  Why?  How?  Qui bono?

http://haskellfamily.blogspot.com/2011/09/colossal-deceit-known-as-underwear.html

I think we can agree that before adding new layers of security to a plethora of them, we should use the measures already in place.  We should also not be so trusting of the things our govt. tells us to accept those new layers.

But there were several more 9/11 terrorists who were supposed to join the others but couldn’t get a visa. And AL Qaeda is constantly changing tactics. Say they got their hands on one of the thousands of old Soviet nuclear warheads and wanted to set it off in a US city. Highly unlikely they could get it across US customs, but bribing Mexican officials to get it into Mexico and sneak across the border? Much easier.