New information has emerged about why U.S. prosecutors may have dropped all charges against Mexico’s former defense secretary, General Salvador Cienfuegos, who had been indicted for money laundering and drug trafficking. Vice News reports Mexico threatened to kick the U.S. Drug Enforcement Administration out of the country and limit cooperation with the U.S. on drug investigations if the case proceeded. Mexico has vowed to open its own probe of Cienfuegos once he returns.