PIEDRAS NEGRAS, Coahuila–The Mexican Los Zetas cartel used a network of oven facilities to cover-up the systematic mass extermination of innocent people during the 2011-2013 period when the cartel had complete governmental control over most of the Mexican state of Coahuila. From the then-governor of Coahuila, down to the city jails, Los Zetas had complete control of every aspect of governmental process and of the lives of Mexican citizens–including news media. Their atrocities in Coahuila have remained largely unreported and undocumented by any governmental agencies; local, state, federal, or international.