They're declared off-limits because the military doesn't want them. Biological and chemical weapons aren't useful to modern militaries. Landmines and cluster mu

They're declared off-limits because the military doesn't want them. Biological and chemical weapons aren't useful to modern militaries. Landmines and cluster munitions are, so none of the countries that actually matter have banned them! This is an excellent overview of why: https://acoup.blog/2020/03/20/collections-why-dont-we-use-chemical-weapons-anymore/ https://acoup.blog/2020/03/20/collections-why-dont-we-use-ch...