In 2008, Mexico passed a series of federal constitutional reforms requiring oral adversarial criminal trials. The reforms give Mexican states until 2016 to implement the shift from a written inquisitorial system to the new oral adversarial system. At the time of this writing, twenty-four states have implemented the changes to some degree, with varying degrees of success.
Paul J. Zwier & Alexander Barney,
Moving to an Oral Adversarial System in Mexico: Jurisprudential, Criminal Procedure, Evidence Law, and Trial Advocacy Implications,
Emory L. J.
Available at: https://scholarlycommons.law.emory.edu/eilr/vol26/iss1/9