The Reizstoffwerfer 99 (RW 99) (German for "irritant thrower") is a backpack device for squirting a solution of CN gas in water (0.5% as standard, but the ratio can be varied), for riot control. It is designed similarly to a backpack pressurized-liquid flamethrower, but without an igniter. It is used by Swiss police: Zurich has 12 or more; Aargau have 4 and on 15 January 2002 decided not to buy 8 more. It is made in northern Germany. Its maximum range is 20 to 30 meters (= about 65 to 100 feet). There is allegation that the squirted liquid can burn the skin if not washed off quickly enough..
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