It's not illegal (in the US in most jurisdictions, not a lawyer so check before you buy) to own one. In fact, they are sold to private entities all the time, m

It's not illegal (in the US in most jurisdictions, not a lawyer so check before you buy) to own one. In fact, they are sold to private entities all the time, mostly event venues. You can even buy one right now on eBay: https://www.ebay.com/itm/LRAD-1000X-Long-Range-Acoustic-Device-Sonic-Cannon-Crowd-Control-Riot-/272661922096 https://www.ebay.com/itm/LRAD-1000X-Long-Range-Acoustic-Devi... Using it, however, would likely run afoul with local noise ordinances.