Bruce Schneier has a really good succinct post on The Two Classes of Airport Contraband.
"There are two classes of contraband at airport security checkpoints: the class that will get you in trouble if you try to bring it on an airplane, and the class that will cheerily be taken away from you if you try to bring it on an airplane. This difference is important: Making security screeners confiscate anything from that second class is a waste of time. All it does is harm innocents; it doesn't stop terrorists at all."
If you're caught with a gun or bomb you'll be arrested, so even if screeners aren't 100% effective, terrorists aren't going to risk it. If your plot depends on a liquid, if such a thing is even possible, you're not deterred because getting caught means you'll just try again.
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