Related Rule
Practice Relating to Rule 70. Weapons of a Nature to Cause Superfluous Injury or Unnecessary Suffering
In its oral pleadings before the ICJ in the Nuclear Weapons case in 1995, Zimbabwe stated that it fully shared the analysis by other States that “the threat or use of nuclear weapons violates the principles of humanitarian law prohibiting the use of weapons or methods of warfare that create unnecessary suffering”. 
Zimbabwe, Oral pleadings before the ICJ, Nuclear Weapons case, 15 November 1995, Verbatim Record CR 95/35, p. 27.
According to the Report on the Practice of Zimbabwe, Zimbabwe “does not employ any weapons meant to cause unnecessary suffering or superfluous injury, e.g. exploding bullets, incendiary weapons, booby-traps, etc.”. 
Report on the Practice of Zimbabwe, 1998, Chapter 3.1.