The plaintiffs, two photojournalists, three protesters, and a videographer, say they experienced migraines and severe ringing in their ears in the immediate aftermath of the protest. Three reported experiencing continued ringing in their ears as of last August, and a fourth suffered nerve damage in his ear as a result of the blasts, according to the suit.
The LRAD was developed as a military sound weapon following the 2000 attack on the USS Cole in Yemen. Police departments have since acquired the devices to use for crowd control. The NYPD first used one to make announcements during the 2004 protests against the Republican National Convention. In 2009, Pittsburgh police used the LRAD's high-deciblel weapon function against protesters at the G-20 financial summit.
In a 2010 briefing, the NYPD Disorder Control Unit described the Pittsburgh deployment by saying the LRAD was "used successfully." However, as lawyers for the Black Lives Matter protesters note, Pittsburgh paid $200,000 to settle litigation stemming from its handling of the protest, including $72,000 to a bystander who suffered permanent hearing loss from the LRAD.
The backpack-sized LRAD 100x used by the NYPD in 2014 can emit sounds up to 137 decibels, according to marketing materials. Exposure to sound levels over 85 decibels can cause hearing loss, according to the National Institute for Occupational Safety and Health.
http://gothamist.com/2017/06/01/lrad_lawsuit_nypd.php
I don't care about BLM per-sea .... but this is bull ####