Chemical warfare
Schedule 3 Substances: These chemicals have many uses other than chemical warfare. One example is phosgene.  It can be used as a chemical weapon, but it is also an important chemical used to make plastics.  Another example is chloropicrin, which has also been used as a chemical weapon, but is also used as a fumigant (for example, to kill insects in a house). The OPCW must be told of, and may inspect, any company that makes more than 30 tons of these chemicals in a year.