My father stills travels a lot. On his last flight (which was early AM, so very few people going through security / milling about), he put his carry-on to be x-rayed, it went through and he was then told he had to have a "random/mandatory" pat down. Queue a few minutes later he was let through and recuperated his carry-on bag on the other side of the X-Ray machine.
Each time he travels, he purposely buries his Rolex deep in his carry on luggage so as to specifically not have to take it off when going through security / risk it being stolen.
On this occasion, up boarding the flight, he went to put on his watch, only it wasn't there.
As it was buried to deep in a bag in a pocket at the bottom of the bag, covered in other items (a computer, two book, a pen case with two Mont Blanc pens etc etc etc), the only way anyone could know it was there was by the X-Ray. They specifically took the watch and had carefully replaced everything else back the way it had been. So, as there was almost no one near the security checkpoint, the only conclusion is that it was stolen by someone working for Airport Security or who had seen it in the X-Ray, or who had been told about it by someone working the X-Ray machine.
Needless to say, he is really, really pissed. But trying to claim it was stolen by airport security is impossible.
Lesson learned: think twice about flying with a valuable watch. Even the security is full of thieves.