Home Depot in LA installs noise machines that ‘penetrate bones’ to deter day laborers
(www.theguardian.com)
There's an even more fundamental flaw to this plan: who wants to go shop somewhere that has a fucking LRAD blasting people on the way in? Even if I was the type of idiot that shopped at home depot instead of any other big box home improvement store, I would immediately go to a competitor that didn't actively irritate their customers for no reason.