COLUMBUS, N.M. - On Sept. 5, a man calling himself Miguel Alfonso Salinas was apprehended off a deserted highway near the U.S.-Mexico border. The tinted windows on Alfonso Salinas' vehicle aroused the suspicion of Border Patrol agents patrolling a dark and desolate stretch of Highway 9, which runs parallel to the border and is the site of large numbers of illegal crossings. The agents discovered three Mexican migrants in the vehicle with Alfonso Salinas. But what they discovered several days later made a far greater impression. Alfonso Salinas was not who he seemed, according to U.S. Department of Justice and...