Tear gas is a chemical weapon also known as "demonstration control agents" (DCAs). It's designed to disperse large crowds, typically in outdoor settings. Tear gas contains lachrymatory agents, ...

The repeated use of tear gas by federal immigration officers in Chicago has renewed a debate about how chemical irritants should be used by law enforcement personnel. By Mitch Smith Federal agents ...

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Chicago might see less tear gas as Operation Midway Blitz diminishes. And, when it is used, it might be less effective in colder, wetter weather. But wind adds a factor of unpredictability for a ...