US court confirms danger posed by 'sound cannons'. "The problem posed by protesters in the street did not justify the use of force, much less force capable of causing serious injury, such as hearing loss," the court said in its ruling.

US court confirms danger posed by 'sound cannons'. "The problem posed by protesters in the street did not justify the use of force, much less force capable of causing serious injury, such as hearing loss," the court said in its ruling.

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