United Nations General Assembly resolution
In 1966, United Nations General Assembly resolution 2162B called for, without any dissent, all states to strictly observe the protocol. In 1969, United Nations General Assembly resolution 2603 (XXIV) declared that the prohibition on use of chemical and biological weapons in international armed conflicts, as embodied in the protocol (though restated in a more general form), were generally recognized rules of international law. Following this, there was discussion of whether the main elements of the protocol now form part of customary international law, and now this is widely accepted to be the case.