Originally Posted by
SnallaBolaget
Randomness in security systems add unpredictability. in the case of WTMDs, you might plan on taking a ceramic knife through the portal, knowing that it contains no metal and won't set off the alarm. Since the portal has a "randomizer", however, you still can't be sure you won't get a pat-down, and the knife is found, and you're in trouble.
Just one example.
-SB-
Oh good grief, are we have to the ceramic knife nonsense? The biggest threat to an aircraft is not the ceramic knife or any other non-metallic primary attack weapon. It is explosives, which, incidentally, the NoS can't detect when carried by a well trained person.
Pull a knife on a plane and you likely won't ever live to see the outside of said plane. People aren't going to let you do whatever you want. And the cockpit doors are hardened so what exactly would be the purpose? You scare some passengers and end up with multiple fractures (and still alive if you are really lucky).
The answer to the whole security theater is to focus on finding explosives. The TSA removed the mechanical means when they threw away the puffer machines. The living means of detection is waiting for service at dog pounds across the country.