From CBS News:
Something troopers threatened to use to clear the crowd made a lot of ears perk up. It’s called a “long range acoustic device,” or LRAD.
Minnesota State Patrol troopers used a powerful sound system first used by the military in Maple Grove, Minnesota, to communicate and disperse noisy protesters.
“The LRAD is like a loudspeaker, but it focuses the sound in a narrow cone, so that if you’re inside the cone, it’s extremely loud,” said retired Marine Colonel Mark Cancian, a senior adviser for the Center for Strategic and International Studies.
The Minnesota State Patrol says the LRAD has been in use since 2013 to ensure “…entire groups can hear when an event is declared unlawful and they have been told to disperse.”
Cancian describes the effect of the unit as “overwhelming,” when it is at full volume.
“We used it in Iraq when I was with the Marines. We tested it on the staff; they gave us the demonstration. If you’re in the cone, it sounds like the voice of God is speaking to you,” explained Cancian.
Minnesota State Police tested an LRAD against protestors on partial volume, announcing: “This is a test of the Long Range Acoustic Device—LRAD. One, two, three.”
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Read more at CBS News
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