Knife Constructed from Sapphire

These knives are completely constructed from non-metallic materials. The blade is made from artificial sapphire, which is harder than any other gemstone except diamond, and the blade from bone.

While the technology required to build a usable sapphire knife is pretty neat, it raises significant airport security concerns. Hopefully this doesn't mean that I'll be subjected to full bag and body searches in the future! link

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Yes, airport security is mainly public relations. It's the classic case of shutting the gate after the horse has bolted. I don't know if you remember pre-9/11 but the conventional wisdom for a hijack was to keep calm and do what you are told. You might end up in Switzerland or Beirut but you'd probably get out alive. So, of course, a pilot would give control of the plane to a guy who had a knife to the throat of a hostess.

Post 9/11, no captain is going to open the cockpit door to a bad guy with a weapon and the passengers are not going to sit there calmly either. So the whole idea of banning knives on planes was obsolete on November 12th 2000.

And banning the sale of undetectable knives in the USA is going to help how? If they are undetectable, they'd be pretty easy to import.
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I have recently designed two small folding ceramic pocket knives and specified stainless steel for the handles.

The ONLY reason for requiring stainless steel was to permit detection by airport magnetron detectors.

Knives that can not be detected either are or soon will be banned from sale in the USA.
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Hey Jason! BoingBoing has a post today about Fedex testing a missile defense system on its planes:

I may be an idiot, but even a broken clock is right twice a day.
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