Chemical warfare
Schedule 1 Substances (Chemicals): These chemicals can be used for nothing but chemical weapons (or for very few other things). Because of this, they may only be made or used for research; medicine; to make medications or antidotes; or for protective reasons (for example, to test chemical weapons sensors, which can tell when a chemical weapon is nearby, or to test protective clothing). Examples include nerve agents, ricin, lewisite, and mustard gas. If a country makes over 100 grams of any of these chemicals, the country must report this to the Organisation for the Prohibition of Chemical Weapons (OPCW). A country may have a stockpile of no more than one ton of these chemicals.