A highly toxic gas that has been used as a chemical warfare agent. It is an insidious poison as it is not irritating immediately, even when fatal concentrations are inhaled. (From The Merck Index, 11th ed, p7304)

A group of methane-based halogenated hydrocarbons containing one or more fluorine and chlorine atoms.

Chemicals that are used to cause the disturbance, disease, or death of humans during WARFARE.