The story of how a chemical weapon went from the battlefield to the streets One hundred years ago, French troops fired tear gas grenades into German trenches. Designed to force people out from behind barricades and trenches, tear gas causes burning of the eyes and skin, tearing, and gagging. Chemical weapons are now banned from war zones. But today, tear gas has become the most commonly used form of “less-lethal” police force. In 2011, the year that protests exploded from the Arab Spring to...
