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Convention (IV) relative to the Protection of Civilian Persons in Time of War. Geneva, 12 August 1949.
General provisions. Applicable legislation
Subject to the provisions of the present Chapter, the laws in force in the territory in which they are detained will continue to apply to internees who commit offences during internment.
If general laws, regulations or orders declare acts committed by internees to be punishable, whereas the same acts are not punishable when committed by persons who are not internees, such acts shall entail disciplinary punishments only.
No internee may be punished more than once for the same act, or on the same count.
Commentary of 1958