Soldiers in gas masks advance on World War I Bonus March demonstrators in Washington, D.C., July 1932.

How Tear Gas Became a Staple of American Law Enforcement

In 1932, the “Bonus Army” of jobless veterans staged a protest in Washington, DC. The government dispersed them with tear gas.
ear gas is fired at protesters demonstrating against the death of George Floyd outside the 3rd Precinct Police Precinct on May 26, 2020 in Minneapolis, MN.

Why Do Police Use Tear Gas When It Was Banned in War?

The development of chemical warfare around the time of World War I led to the use of tear gas as a weapon by civilian police forces.
World War 1 soldiers wearing gas masks

The Amoral Scientist

Fritz Haber was a chemist who made discoveries that improved global agriculture… but also helped spawn the modern era of chemical warfare.
French trench in WWI

The Power of Deterrence

The First World War witnessed the first major use of chemical warfare, but by the Second World War deterrence seemed to work. 

Ancient Chemical Warfare

The lethal combination of chemistry and warfare has a long history.