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Nigeria
Practice Relating to Rule 92. Mutilation and Medical, Scientific or Biological Experiments
Nigeria’s Military Manual (1994) recalls the content of Article 12 of the 1949 Geneva Convention I, which “expressly prohibits [subjecting the wounded and sick] to … biological experiments”. 
Nigeria, International Humanitarian Law (IHL), Directorate of Legal Services, Nigerian Army, 1994, p. 13, § 4.
Nigeria’s Manual on the Laws of War provides that biological experiments on all persons protected by the 1949 Geneva Conventions are war crimes. 
Nigeria, The Laws of War, by Lt. Col. L. Ode PSC, Nigerian Army, Lagos, undated, § 6(a).
With regard to the wounded and sick, the manual adds: “It is particularly prohibited to … abandon them to scientific experiments.” 
Nigeria, The Laws of War, by Lt. Col. L. Ode PSC, Nigerian Army, Lagos, undated, § 35.
Nigeria’s Geneva Conventions Act (1960) punishes any person who “whether in or outside the Federation, … whatever his nationality, commits, or aids, abets or procures any other person to commit any such grave breach of any of the [1949 Geneva] Conventions”. 
Nigeria, Geneva Conventions Act, 1960, Section 3(1).