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Mexico
Practice Relating to Rule 116. Accounting for the Dead
Section A. Identification of the dead prior to disposal
Mexico’s Army and Air Force Manual (2009), in a section on the 1949 Geneva Convention I, states:
Parties to the conflict must ensure that burial on land or at sea or cremation of the dead, carried out individually as far as circumstances permit, is preceded by an examination, if possible a medical examination, of the bodies, with a view to confirming death and establishing identity. 
Mexico, Manual de Derecho Internacional Humanitario para el Ejército y la Fuerza Área Mexicanos, Ministry of National Defence, June 2009, § 92.