It is "NO" for now actually.
In fact, since the end of WWII, the only legislature that requires weapon technology to be somewhat humane is the Geneva Convention. However, it does not require all member states to evaluate new weapon technology, but only those weapon technology that existed when the Geneva Convention was signed. This additional requirement to evaluate new weapon technology is in fact known as the Additional Protocol I to the Geneva Convention which so few states has ratified it. Article 35 of Additional Protocol I reads each “High Contracting Party is under an obligation to determine whether [the new weapon’s] employment would, in some or all circumstances, be prohibited by this Protocol or by any other rule of international law applicable to the High Contracting Party.” The Biological Weapon Convention prohibits the development and deployment of any biological weapons. It would be very difficult to argue that non-lethal biological weapons, such as certain incapacitating agents, can be justified by prophylactic, protective or other peaceful purposes. However, things are not so clear under the Chemical Weapon Convention.