https://www.dailymail.co.uk/ushome/article-12665029/Jeff-Wilson-arrested-hong-kong-gun.html
...pro 2nd Amendment state legislator arrested in Hong Kong after finding a gun in his carry-on luggage...
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That revolver would be in the toilet holding tank if it was me...
I doubt if any of the toilets on the plane or in the terminal have holding tanks. But, you're right, ditch that thing. Don't turn it in. He was naive.