Gun landed former Marine in Mexican prison

A former U.S. Marine is free after spending four months in a Mexican prison. Jon Hammar was held on a questionable gun charge because he crossed the border with his great grandfather's antique shot gun, which was deemed too short by Mexican authorities.

U.S. officials told him it was permitted after he completed the proper paperwork, but he was arrested as soon as he entered the country. He says the purpose of the gun was so he and the friend he was traveling with could hunt while camping. The trip was intended to be a surfing vacation in Costa Rica.

Hammar described the harsh conditions to Anderson Cooper. Other inmates in the prison tried to extort money from his parents. He was then removed from the general population and placed in solitary confinement where he was chained to his bed.