What is tear gas? Learn more about the evolution of tear gas and why some scientists recommend a revaluation of its use.

The Army describes the type of device the diver found as a riot control hand grenade. M7A3 grenades are filled with CS gas and are “designed to control counterinsurgencies and for other tactical ...

The directive comes after more than 100 nights of demonstrations that have seen police officers and federal agents use the chemical agent, which is a powerful type of tear gas, to disperse protesters.

CS gas refers to the active ingredient in tear gas, 2-chlorobenzalmalononitrile, the incapacitating agent that causes tearing and burning sensations in the eyes, mouth, nose and sinuses.

Law enforcement officers used CS gas – a type of tear gas – in bid to restore order, while a limit on the ability of police to use the substance was in effect, FOX 12 of Oregon reported.

LOVE COUNTY, Okla. (Gray News) – A scuba diver in an Oklahoma lake discovered a gas grenade while under the lake’s surface, according to authorities.

The most common types of tear gas are CS gas, a chemical manufactured in the 1950s and 1960s for use in riot control, and pepper spray, which is isolated from chili peppers.

Although the DC Council has now banned its use, DC Police ordered $100,000-worth of tear gas in June in response to ongoing and possible future rioting.

The Oklahoma Highway Patrol's bomb squad was called and also confirmed the device was a live CS grenade. It was able to date the device to somewhere around the early 2000s, the sheriff's office said.

LOVE COUNTY, Okla. (Gray News) – A scuba diver in an Oklahoma lake discovered a gas grenade while under the lake’s surface, according to authorities.