I had the occasion to go through airport security over the weekend, and I realized an interesting thing. If you want to get through security with a large knife, all you have to do is try to slip one through in your bag a few times over the course of a few days or weeks.
Each time you fail, you act like an idiot ("oops!"), and give them the knife, proceeding without it to your airplane. Eventually, the guy watching the x-ray screen will miss the knife, you will proceed, and you will finally be able to cut your airplane steak.
I learned this lesson by accident when I nearly missed my plane. I had planned on checking my small bag with the knife in it, but when I arrived at the airport late (my fault), I could either miss my plane, or try to sneak the knife through.
Since I didn't want to miss my flight, I tried and succeeded to get the pictured knife through. Pretty amazing that a three inch blade can pass right by, eh?
I wonder if terrorists are patient...
There's an identical article to my own over here: http://www.schneier.com/blog/archives/2008/09/the_two_classes.html.
That author points out that anytime that we confiscate something and don't punish people, it's essentially a waste of time because terrorists can just shrug and try again the next day. Bombs and guns he says will ruin your day, but a liquid bomb (such as a bottle of water), and a pocketknife (such as above) will just get thrown away. The next day, you just try again. Eventually you can get it through, if you need to.
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