Biological Weapons Convention
One of the challenges of the Biological Weapons Convention (BWC) is, in order to test permissible defenses, can a signatory develop hypothetical offensive weapons. The Biological Weapons Convention (BWC) of 1972 is a disarmament treaty, not an arms control treaty. When it was negotiated, the Geneva Protocol of 1925, which prohibits the use of biological weapons (BW), was already in force and considered a part of international law. But the negotiators of the BWC wanted to "exclude completely the possibility" of biological agents and toxins being used as weapons by abolishing the weapons themselves.