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With the help of Homeland Security grants, police departments nationwide looking to subdue unruly crowds and political protesters are purchasing a high-tech device originally used by the military to repel battlefield insurgents and Somali pirates with piercing noise capable of damaging hearing.
Police acknowledge that they deployed the so-called Long Range Acoustic Devices (LRADs) as a safeguard at recent political conventions, protest-plagued international summit meetings and this summer's volatile town hall meetings on health care.
Officers were captured last week on video using the devices against protesters at the Group of 20 summit in Pittsburgh, causing many to cover their ears or disperse to escape the shrieking sound.
San Diego-based American Technology Corp. insists the devices it manufactures and sells are not intended to be used as sonic weapons but rather to "influence the behavior and gain compliance" from people.
But the company stated in a Securities and Exchange Commission filing in September 2008 that the device is "capable of sufficient acoustic output to cause damage to human hearing or human health," expressing concern that its misuse could lead to lawsuits.
• To hear the device being used in Pittsburgh in a YouTube video, click here.
It is that fact that has health and civil rights advocates concerned that the devices could fall into untrained hands and cause physical harm.
"Police should not be using military weapons that are likely to cause permanent hearing loss on demonstrators or anyone else," said Vic Walczak, legal director of the American Civil Liberties Union of Pennsylvania who objected to the Pittsburgh police's use of the device.
The dish-shaped device generate tones that are higher than the normal human threshold for pain, according to the device's own data sheet. They can be aimed in a narrow beam at specific targets with what the company has described as "extreme accuracy."
The American Tinnitus Association said Wednesday that protesters at the G-20 summit were "acoustically assaulted" with sound of over 140 decibels, which it described as "like the kind of sound pressure members of the armed services might face from an Improvised Explosive Device (IED)."










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