MEXICO CITY — Mexico is adopting U.S.-style public trials and a presumption of innocence.

President Felipe Calderon has signed a sweeping judicial reform that replaces closed-door proceedings in which judges rely on written evidence.

The constitutional amendment signed Tuesday will have prosecutors and defense lawyers arguing their cases in court.

Mexico's Congress dropped a proposal to allow warrantless searches after human rights groups protested.

Instead the law creates a new class of judges who can rule more quickly on warrant requests.

The law also allows prosecutors to hold organized crime suspects without charge for up to 80 days.