As I've said before on this forum, shortly after the 11-9 debacle, I was discussing the heightened security with my F.O.:
"What I don't understand," he said, "Is why these civil servants insist on inventing their own stupid security procedures and it never occurrs to them to consult security experts about the problem which are freely available to them.
Unlike me, my F.O. was ex-RAF and was referring to our armed forces!
P.P.