After all, passengers joining an aircraft have been through a supposedly rigorous system of security checks, right ?!
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Are you sure? Is that true everywhere you go?
Certainly not at one very large UK airport. On a recent trip to Spain I picked up the wrong waist belt-bag and during the week found I'd taken my large Swiss Army Knife and a large nail file in error. The bag went through the x-ray machine but I was not challenged... On the way back I packed them "below".
So much for airport security