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Convention (III) relative to the Treatment of Prisoners of War. Geneva, 12 August 1949.
Essential rules. I. General principles
No prisoner of war may be tried or sentenced for an act which is not forbidden by the law of the Detaining Power or by international law, in force at the time the said act was committed.
No moral or physical coercion may be exerted on a prisoner of war in order to induce him to admit himself guilty of the act of which he is accused.
No prisoner of war may be convicted without having had an opportunity to present his defence and the assistance of a qualified advocate or counsel.
Commentary of 1960