Well I'm an engineer and I have been relieved of my leatherman at the security gate on a number of occasions. In my toolbox (airside) I keep a number of screwdrivers of assorted size and lethality, chisels, a couple of stanley (craft type) knives etc etc.
When I board aircraft that are bound for that sesspit of the world, the States, I am searched. However, when I then disembark the aircraft, having carried out my duties, I am not searched so who knows what I may have left secreted on board. It's a complete farce designed to appease the yanks who have not the first idea when it comes to security as I witnessed first hand in LA a couple of times this year.