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Convention relative to the Treatment of Prisoners of War. Geneva, 27 July 1929.
Part III : Captivity #Section IV : Relations of prisoners of war with the exterior - Art. 40.
Art. 40. The censoring of correspondence shall be accomplished as quickly as possible. The examination of postal parcels shall, moreover, be effected under such conditions as will ensure the preservation of any foodstuffs which they may contain, and, if possible, be done in the presence of the addressee or of a representative duly recognized by him.
Any prohibition of correspondence ordered by the belligerents, for military or political reasons, shall only be of a temporary character and shall also be for as brief a time as possible.