For four years, former U.S. Marine Jon Hammar fought in Iraq and Afghanistan. Now, he’s chained to a bed in a Mexican prison.

In August, Hammar was traveling through Mexico on his way to Costa Rica for a surfing trip. He approached U.S. Customs about bringing along a gun that belonged to his great-grandfather. They advised him that he’d have to fill out a registration form and declare the weapon immediately upon crossing the border. Hammar tried to do just that but was immediately arrested and has been in prison ever since.

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