A quick story of interest

A little over two weeks ago I flew from Auckland to Christchurch on Quantas to get from the North Island to the South Island, a short one hour flight. I checked most of my stuff but carried on my daypack. When I ran it thru the x-ray machine at the airport the security man told me "You'll have to take the pocket knife out." I politely told him that I did not bring a pocketknife to New Zealand with me, there must be a mistake, and to please take a look. He took some stuff out, ran it thru the machine, and told me that it was still there. Wondering what he was seeing, I implored him to take more stuff out and to keep looking. He did and the knife still showed up. After more digging there was indeed a pocket knife in the pack. My Mom had been using this pack before me and she must have left her pocketknife in there. Security let me return to the ticketing counter and check that back to that I could keep the knife. No harm, no foul. The
interesting thing is that they I got this same bag past security in Charlotte and again at the international terminal in Los Angeles. Not surprising really...