Use of LRAD is a criminal offence. You can't do an act that can impact the lives negatively.
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https://www.vice.com/en_us/article/dyzpna/audio-engineers-built-a-shield-to-deflect-police-sound-cannons 
More Technology » 
Use of LRAD is a criminal offence. You can't do an act that can impact the lives negatively.