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Well what would be the point in scanning those permitted to carry knives ?
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Sikhs you mean?
Well they would have to remove while passing through the detectr and have it straight back as they would any other metal item.
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just had a thought a ceramic gun can foil metal detectors ,so presumably so can a ceramic knife[found in many kitchens]...... forget the gun google says its a myth
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The ceramic gun isnt exactly a myth, it was a press over reaction to the Glock 9mm in the early 90's. Despite being mainly composite they a metal barrel and firing mechanism,
Ceramic knives , yep nowt you can do about those.