Peace gas

Tear gas is technically a no no... if you're at war.

Despite its ubiquity across the globe and in United States, tear gas is a chemical agent banned in warfare per the Chemical Weapons Convention of 1993, which set forth agreements signed by nearly every nation in the world — including the United States. The catch, however, is that while it’s illegal in war, it’s legal in domestic riot control. That means Turkey got to use it on its protesters last year. That meant Bahrain got to the do the same. And now, in Ferguson, cops are likewise blasting residents protesting the police for the killing of an unarmed teen named Michael Brown.

It's one of our most peaceful chemical weapons.