A Good Book
This is an interesting thread which has demonstrated to me that many flight crew have a deep understanding of security issues. Very welcome. It's a pity that they are not allowed more influence over the laws and rules that are applied. Airport security would be less expensive, less mindless and much more effective if they were allowed that influence.
May I recommend a book by one of the world's foremost security experts, Bruce Schneier, which covers many of these issues with brilliant clarity.
It's called Beyond Fear --Thinking sensibly about security in an uncertain world.
ISBN: 0-387-02620-7