Here's a story for you guys. 2 years ago, I was flying with my parents from Philadelphia to Israel with a stop over in Germany.
After we had checked our luggage, I realized that I had kept a Kershaw Leek in my jacket pocket left there from a recent camping trip. For those that don't know, this is a fairly large and intimidating assisted-opening (read: switchblade) all metal folding knife. Well, the knife's worth about $50 bucks and you can bet I didn't want to lose it. I thought about hiding it in a plant or something, but I figured I might as well kiss it goodbye if I did that.
Of course, I also didn't want to let my parents know I had it, so in the bathroom, I went and put the knife in my camera case with a bunch of adapters and cables and the like, which was in my carry-on. In retrospect, this seems like an incredibly stupid thing to do for a $50 item, but I took the risk... here is what happened:
At security, I had to take my shoes off, and take my out my brother's laptop, which I was bringing to him (he was meeting us later). I made it without a hitch. One down, so far so good.
In Germany, we had to be searched again. Once again, no problem.
In Israel (and you can BET they have some serious security there), they didn't find the knife a third time. ALL CLEAR!
Now I'm not bragging or condoning what I did here, and I certainly checked the knife in my luggage on the way back, but this story does illustrate a point. IMO, security is for peace of mind; for show. If someone really wants to get something aboard, there is quite the chance that they will. I recall a study in which a student attempted to board planes with guns several different times as an experiment, and security found less than half of them.
I'm not saying that their shouldn't be security on airlines. Its just that 90% of what agents get in a huff about is the wrong item belonging to the wrong person.
Another brief story: On a flight to Costa Rica, both carry on and luggage were X-rayed BEFORE check in. I was hastled at length about a simple wine cork-screw (not even a foil knife on it). The item was taped up and put in my check-in luggage. The thing is, there was no other security after the initial check in, and I still had all of my bags! I could have taken a machette out of my major luggage and put it into my carry-on since the carryon was never checked again!!
Man, good thing I'm not a terrorist
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