TSA blathers on and on about their “layers of security” and they even have a handy-dandy color coded chart (those are the best kind of charts) to show how many layers a terrorist has to get through. Here's the layers: 1. Intelligence 2. International Partnerships 3. Customs and Border Protection 4. Joint Terrorism Task Force 5. No-fly list and passenger pre-screening 6. Crew vetting 7. VIPR 8. Canines 9. Behavior detection officers 10. Travel Document Checker 11. Checkpoint/Transportation Security Officer 12. Checked baggage 13. Transportation Security Inspectors 14. Random Employee Screening 15. Bomb appraisal officers 16. Federal Air Marshall Service 17. Federal Flight Deck Officers 18. Trained Flight Crew 19. Law Enforcement Officers 20. Hardened cockpit door 21. Passengers Of course, a lot of these “layers” are of dubious value, and there seems to be some duplication. VIPR and BDO are particularly worthless. Others are effective, such as canines, but for whatever reason aren't used by TSA in any practical sense. But lets focus on Items 20 and 21, hardened cockpit doors and passengers. Had item 20 been in play in 2001, 9/11 could not have happened. As it was, an impromptu application of item 21, passengers, prevented one of the planes from striking its target, which was probably the Capitol building. We have seen passengers irradiated, groped, humiliated – yet TSA itself acknowledges they are the last line of defense. Seems like if TSA was really interested in stopping terrorism they would not do these demoralizing things to their last line of defense.