I've always wondered about the sanity of fully screening flight crews after an episode I witnessed a few months after 9/11...
A few flight attendants cut in line in front of me just before the x-ray machines at the terminal security (which they are entitled to do, no complaints if they're cute) and the last one through set off the metal detector and had to be wanded. She asked the TSA guy "uhhh, what exactly are you looking for, anyway?"
He replied, "anything you may have on your person that you could use to attempt to gain access to the cockpit." That seemed like a logical and fairly intelligent response from someone moments away from digging through my skivvies on my carry-on to find the suspicious USB cable.
That is, until she pulled the key that was on a laniard around her neck into the open, and remarked, "Oh, you mean something like THIS?"
*facepalm*