FILE - In this Sept. 18, 2012 file photo, Mexican army soldiers guard an entrance to the state prison in Piedras Negras, Mexico. Officially it was a prison, but inside it hid another reality: a center of operations where the Zetas cartel modified vehicles and manufactured uniforms, locked up kidnap victims and dissolved bodies in acid, according to a College of Mexico report released Tuesday, Nov. 21, 2017, based on witness statements, documents and public data. (AP Photo/Adriana Alvarado, File)
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