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This happens ALL THE TIME. I accidentally boarded a plane (through SEATAC) in 2007 with this knife in my pocket: http://www.amazon.com/Gerber-45860-Ranger-Serrated-Knife/dp/...

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With an item like that there is no real excuse for them to miss it. There is no mistaking that as something else. It is clearly a knife. It just proves the whole thing is "Security Theatre".

Some folks might say it's just proof they need to spend a tonne of your tax dollars on better, bigger, scanning machines.

I think this is as much ( more ) about harvesting tax dollars as anything else

It was in my pocket. I walked through a metal detector. It was just a matter of the detector not being calibrated correctly or not being set to an adequately high sensitivity setting. That such things are possible is a testament to the uselessness of the system, if they can't manage to promulgate standards and procedures sufficient for the proper operation of a metal detector what hope is there that any other equipment is being operated correctly?

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