Published online by Cambridge University Press: 05 June 2012
Rule 86. The use of laser weapons that are specifically designed, as their sole combat function or as one of their combat functions, to cause permanent blindness to unenhanced vision is prohibited.
Practice
Volume II, Chapter 31.
Summary
State practice establishes this rule as a norm of customary international law applicable in both international and non-international armed conflicts. Blindness to unenhanced vision refers to blindness caused to the naked eye or to the eye with corrective eyesight devices.
International armed conflicts
Although the adoption of Protocol IV to the Convention on Certain Conventional Weapons governing the use of blinding laser weapons in 1995 is only recent, the circumstances of that adoption and developments since then indicate that this is an instance of customary international law developing as a result of the negotiation and adoption of a treaty. In its judgement in the North Sea Continental Shelf cases, the International Court of Justice stated that customary international law can develop in this way:
Although the passage of only a short period of time is not necessarily, or of itself, a bar to the formation of a new rule of customary international law on the basis of what was originally a purely conventional rule, an indispensable requirement would be that within the period in question, short though it might be, State practice, including that of States whose interests are specially affected, should have been both extensive and virtually uniform in the sense of the provision invoked; and should moreover have occurred in such a way as to show a general recognition that a rule of law or legal obligation is involved.
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