Don't you know that a sharpened credit card works just a good, even better than, a box cutter on people? A) it's extremely sharp, B) it's fairly flexible so as not just snap off when trying to get its deed done, C) it hides easily in the palm of your hand (in other words the victim would never see it coming), D) it's easily handled, with nice little 'grooves' to help your grip (aka the account numbers).
Please do tell how a 'body scanner' is going to stop that. Or a pat-down. Or anything else that is not so extensive so as to be equivalent to the search one goes through when they are being 'booked' at the local police station.
This security theater we have is the most ridiculous of any 'free' country. I have a friend who grew up in communist Hungary. You know what she said? "In communist Hungary it was never this bad."
Yeah, and your 'air marshal' would be the first target in an attack & all the passengers who were looking to him for protection will be sheep for the slaughter. By the way, wanna know where I heard of the credit card idea? From the Israelis who got it off a guy they caught by profiling. Without, get this, any body scanners!