Raul Benitez, a security expert at the National Autonomous University of Mexico, said the key to catching Yarrington came when authorities traced phone calls he made to his family in Mexico.
Ex-Mexican governor's long flight from justice ends →
"There are abuses by soldiers, but there often isn't this kind of solid proof," he said. "They are not accustomed to acknowledging such cases, unless the evidence is overwhelming."
Mexican soldiers face charges for apparent torture of woman →