As protestors and police officers clash on the streets of Baltimore and other divided cities, some police departments are stockpiling a highly controversial weapon to control civil unrest.

It’s called Skunk, a type of “malodorant,” or in plainer language, a foul-smelling liquid. Technically nontoxic but incredibly disgusting, it has been described as a cross between “dead animal and human excrement.” Untreated, the smell lingers for weeks.

The Israeli Defense Forces developed Skunk in 2008 as a crowd-control weapon for use against Palestinians. Now Mistral, a company out of Bethesda, Md., says they are providing it to police departments in the United States.

Skunk is composed of a combination of baking soda and amino acids, Mistral general manager Stephen Rust said at the National Defense Industrial Association’s Armament Systems Forum on April 20. “You can drink it, but you wouldn’t want to,” said Rust, a retired U.S. Army project manager.

The Israelis first used it in 2008 to disperse Palestinians protesting in the West Bank. A BBC video shows its first use in action, sprayed by a hose, a system that has come to be known as the “crap cannon.”

Mistral reps say Skunk, once deployed, can be “neutralized” with a special soap — and only with that soap. In another BBC video, an IDF spokesman describes how any attempt to wash it via regular means only exacerbates its effects. Six weeks after IDF forces used it against Palestinians at a security barrier, it still lingered in the air.

Mistral says the United States military has expressed an interest in Skunk, if not yet placed an order. “We’ve demoed it at Fort Bragg. Why? Because they asked about it,” said Rust....