In extreme cases, sonic weapons can cause nausea, dizziness, and even permanent damage. In this case, officials used it to ...

SEATTLE — It’s being touted as a non-lethal crowd control tool by the Seattle Police Department, but Long Range Acoustic Devices, also known as LRADs, are now coming under scrutiny locally and other ...

LRAD sound weapons at protests use focused acoustic beams up to 162 decibels that cause permanent hearing damage, but distance and industrial earplugs provide effective protection.

During protests in the USA, security authorities use LRAD systems for announcements and crowd control. How do these "sound cannons" work?

PORTLAND, Ore. (KOIN) — Mayor Ted Wheeler directed police to not use a device that emits a loud sonic tone for crowd control ahead of another night of protests in Portland. The device is called LRAD, ...

This story was updated at 9:41 a.m. ET on Aug. 18. Violent protests have ravaged Ferguson, Missouri since Aug. 9, after a police officer shot and killed an unarmed 18-year-old who is believed to have ...