First, a brief history of chemical agent deployment is provided to substantiate the past, present, and future use of such agents. Second, chemical agent exposure and reaction information is provided to convey the strong and weak points, dangers, capabilities, and flexibility of this important law enforcement tool. Third, a myriad of chemical agent choices, including delivery, deployment, and operational considerations, are covered to demonstrate the various application possibilities officers have when using these devices to control and resolve real-world situations. Fourth, information concerning the probable terrorist use of chemical/biological weapons of mass destruction is included, since law enforcement officials will be among the first responders to these incidents. Finally, training information is included to emphasize the importance of learning the capabilities, weaknesses, and strengths of chemical-agent devices and associated equipment. 33 references and appended resources for active decontaminate, chemical agent, chemical agent equipment, chemical/biological agent detection equipment, and chemical agent training