In DC we had some back and forth over speakers that emit a high-pitched whine that only people below a certain age can hear... like a dog whistle for kids, but extremely annoying.In the spirit of them decoy owls they put on ledges and cornices to scare pigeons away, how about à bunch of lifesize robocops on all streetcorners. Make them pewter colored so they are more neutral. One arm pointing a taser and the torso revolving 360 degrees at the waistline, and sensors to home in on the bad guys...
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