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Various nations have developed and produced chemical weapons -- substances whose main use is to harm people -- such as nerve gas or mustard gas. The use of such agents has been restricted or banned under various international treaties since before 1899. Nonetheless, stocks still exist, and it is possible to produce them, either in industrial plants or smaller-scale labs. Some military nerve agents, for example, are closely related to organophosphate pesticides, and could be manufactured at pesticide plants. The hazards became more evident after the March 20, 1995, attack by the religious cult AUM Shinrikyo on the Tokyo subway with the nerve gas sarin, which killed a dozen people and injured hundreds of others. Check in with your state emergency authorities, local fire and police departments, and hospital emergency rooms, to find out more about their planning and preparedness for chemical terrorism incidents.