A Mexican constitutional amendment was signed into law by the Senate and President Felipe Calderon, which allows for various changes to Mexico’s court system, including public trials, a right to face the accuser, prosecutors and defense attorneys arguing in court, and a presumption of innocent until proven guilty. Mexico’s former court system, relying on judges working behind closed doors with written evidence, has been called “medieval” attacked by human rights organizations like Amnesty International for their lack of transparency and the extensive detention times (up to eighty days). Additional measures taken with the amendment include requiring police officers to obtain warrants, requiring police to purge ranks of corrupt officers, and charging local law enforcement with organized crime.