Play Live Radio
Next Up:
Available On Air Stations
Watch Live

Military Police Leaders Weighed Deploying 'Heat Ray' Against D.C. Protesters

Military police hold a line near the White House as demonstrators gather to protest police brutality on June 1, 2020 in Washington, D.C.
Olivier Douliery AFP via Getty Images
Military police hold a line near the White House as demonstrators gather to protest police brutality on June 1, 2020 in Washington, D.C.

Hours before federal police officers cleared a crowded park near the White House with smoke and tear gas on June 1, the lead military police officer in the Department of Defense for the D.C. region asked if the D.C. National Guard had a kind of military heat ray that might be deployed against demonstrators in the nation's capital, according to one of the most senior National Guard officers on the scene.

In written responses to the House Committee on Natural Resources obtained by NPR, Major Adam DeMarco of the D.C. National Guard said he was copied on an email from the Provost Marshal of Joint Force Headquarters National Capital Region. He was looking for two things: a long range acoustic device, a kind of sound cannon known as an LRAD, and a device called the Active Denial System, or ADS.

The ADS was developed by the military some twenty years ago as a way to disperse crowds. There have been questions about whether it worked, or should be deployed in the first place. It uses millimeter wave technology to essentially heat the skin of people targeted by its invisible ray.


In his written response, DeMarco, who has sought whistleblower protection, quoted from an email he said was forwarded to him that originated from the Provost Marshal which read, the "ADS can provide our troops a capability they currently do not have, the ability to reach out and engage potential adversaries at distances well beyond small arms range, and in a safe, effective, and non-lethal manner."

The email went on to say that the ADS can direct a beam toward a group and that "provides a sensation of intense heat on the surface of the skin. The effect is overwhelming, causing an immediate repel response by the targeted individual."

Last month, the New York Times reported that U.S. border officials weighed deploying the so-called "heat ray" against migrants a few weeks before the 2018 elections. The Times reported that Kirstjen Nielsen, who was the secretary of homeland security at the time, told an aide after the meeting, according to the Times story, "that she would not authorize the use of such a device, and that it should never be brought up again in her presence."

Yet, according to DeMarco, it was something considered by DOD's lead military police officer the morning of June 1 after days of fiery protests and looting in Washington. DeMarco said in his written comments that he responded about a half hour later that "the D.C. National Guard was not in possession of either an LRAD or an ADS."

NPR made multiple calls and sent multiple emails to the Joint Force Headquarters National Capital Region for comment, but has not heard back.


Sound cannon

The second piece of equipment DeMarco says they asked for was a kind of sound cannon called an LRAD, a Long Range Acoustic Device. NPR reported last week that by not using one, they may have violated court-ordered regulations that spell out how demonstrators in the nation's capital are to be warned before aggressive tactics are used against them.

Attorneys who helped write the agreed-upon rules as part of a 2015 settlement-agreement said federal police are required to warn large crowds multiple times they need to disperse, and they must do so loudly enough that the orders can be heard for blocks. That's how an LRAD would be used in this case.The LRAD emits a piercing noise and then can broadcast a voice or a recording at a deafening level. The idea is to allow people at the back of a crowd to hear instructions.

That did not appear to happen on June 1. Protesters who were there said police advanced through the crowd with little warning, firing tear gas and smoke canisters shortly before President Trump appeared outside for a photograph in front of St. John's Episcopal Church.

"They have an obligation to notify that group that they are in violation of the law and to give them the opportunity to comply with a lawful order," said Mara Verheyden-Hilliard who helped write the settlement agreement. In a class action lawsuit, she represented demonstrators, tourists and passersby who were arrested during a demonstration against the International Monetary Fund and World Bank in Washington in 2002.

Gregory Monahan, acting chief of U.S. Park Police, told lawmakers in July that his officers had abided by the rules in that agreement. "The protocol was followed," he said during sworn testimony before the House Committee on Natural Resources in July. "There were three warnings given and they were given utilizing a Long Range Acoustic Device; it's called an LRAD, that's what it stands for, that was the device used."

DeMarco said in his written answers to the committee that the National Guard "was not in possession" of an LRAD that day.

"There is zero evidence that there were any officers who can testify that they were in the farthest reaches of the crowd," Mara Verheyden-Hilliard, who helped write the rules of engagement as part of the settlement agreement said. "There has to be documentation that the notice was given multiple times, and there are supposed to be recordings made that the notice was given. We wrote all these in specifically for this reason. In fact, unfortunately, it would appear in anticipation of what happened in Lafayette Park."

A U.S. Park Police spokesman told NPR that Monahan "stands by his testimony to the committee." The official said because of ongoing litigation the U.S. Park Police couldn't comment further.

Copyright 2020 NPR. To see more, visit