"The only way to determine the source of the ticking came down to a $13.21-an-hour worker: I'd need to follow my trainer's instructions and go EDU - elbows deep in underwear.".
A very interesting pick is the Confessions of a Baggage Screener from Wired Mag. About both the tech-side of airportsafety and the reality of being a screener. All this humping on the security and one learn that the ones that should be the last front and save us from being blown to pieces when eating the dinner 10k metres over the Atlantic don't get the proper training and sometimes don't care to do a proper job. And learning that the technology is not that reliable as it sometimes seem.