Then he tells the authorities about it in Japan and is sent home. He's lucky he was not arrested and jailed. Minimum sentence in Japan is something like one year for an unregistered firearm.
https://www.wsbtv.com/news/local/at...ter-going-through-airport-screening/903900169
https://www.wsbtv.com/news/local/at...ter-going-through-airport-screening/903900169
TSA has determined standard procedures were not followed and a passenger did in fact pass through a standard screening TSA checkpoint with a firearm at Hartsfield-Jackson Atlanta International Airport on January 2. TSA will hold those responsible appropriately accountable