The fellow Marine who was with Jon Hammar when Mexican customs officials arrested him for carrying an illegal shotgun said his friend made every effort to follow the law, but got bad information from officials on both sides of the border. Ian McDonough, 27, told FoxNews.com that four U.S. Customs and Border Protection agents told Hammar before he crossed into Mexico that as long as the required permit, which he completed, was submitted and he declared the gun to Mexican authorities, there would be no problem in bringing the vintage shotgun across the border. "Jon was told to fill out...