According to Article 57(3), the last page of the voter’s identification document is to be stamped to make sure that the voter only votes once. That means that anyone who handles the identification document later may see if the person has voted or not.
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The VOTA database was created within the framework of the joint programme between the Venice Commission and the European Commission "Democracy through free and fair elections". It is managed jointly by the Secretariat of the Venice Commission and by the Mexican Electoral Tribunal of the Federal Judiciary (TEPJF).