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Convention relative to the Treatment of Prisoners of War. Geneva, 27 July 1929.
Part III : Captivity #Section V : Relations between prisoners of war and the authorities #Chapter 3 : Penal sanctions with regard to prisoners of war #I. General provisions - Art. 52.
Art. 52. Belligerents shall ensure that the competent authorities exercize the greatest leniency in considering the question whether an offence committed by a prisoner of war should be punished by disciplinary or by judicial measures.
This provision shall be observed in particular in appraising facts in connexion with escape or attempted escape.
A prisoner shall not be punished more than once for the same act or on the same charge.