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An effective way to disperse rioters & looters would be to send an armored vehicle in to spray them with a very stinky liquid. Is there a chemical that stinks but is not terribly irritating & that breaks down after a few hours? H2S?
What about the chemical added to natural gas/ propane so people can smell it? Can it be put into water? If a suitable chemical doesn't break down within a few hours, is there a chemical that could be sprayed to neutralize it after a few hours?