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Benin
Practice Relating to Rule 70. Weapons of a Nature to Cause Superfluous Injury or Unnecessary Suffering
Benin’s Military Manual (1995) states: “It is prohibited to resort to weapons or methods of warfare of a nature to cause unnecessary losses or superfluous injury.” 
Benin, Le Droit de la Guerre, III fascicules, Forces Armées du Bénin, Ministère de la Défense nationale, 1995, Fascicule II, p. 5.