If riots occur, the cops should wait until the temp is below freezing and unleash the water cannons.
I`ve thought about that, can the Capsaicin molecule be artificially synthesized on an industrial scale? If so, then use a super-concentrate as an ingredient in water cannons, soak the a-holes in it. IF you are male, have you ever made the mistake of eating hot peppers or getting salsa onto your hands and not washing your fingers BEFORE you went pee? NOT FUN! Imagine being soaked, head to foot, in a water/Capsaicin concentrate mix? Every inch of your body and clothing drenched in the stuff!