I got pulled for a random swab and came up positive.
Had been processing brass the weekend/day before. Nothing else.
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I flew for a little over 4 years around the World with the same carry on bag. My carry on bag got searched repeatedly before each trip and was never used after my travels because of where I was going; it got put up in a locker. Well, after 4 years of flying with it Dubai discovered a live .22 LR cartridge, although highly corroded, stuck in the webbing. I was detained for a while but they let me go with a warning, luckily. All ammunition, firearms, and knives are illegal there. The arresting officer didn't even know what it was and thought it had been fired already. When I told him it had not been fired he was scared "it would blow up in his hand."