Research for this intervention took place throughout 2008 and by January 2009 federal authorities were ready to conduct the arrest, but president Calderón asked them to wait until they were sure that the cases rested on sound judicial grounds.
Durante 2008, se hicieron investigaciones para llevar a cabo la intervención, y para enero de 2009 las autoridades federales ya estaban listas para dirigir el arresto, pero el presidente Calderón pidió que esperaran hasta estar seguros de que los casos estuvieran judicialmente blindados.