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There are a couple of reasons. One is that many protesters will want to call the police's bluff so they will not leave even when told gas will be used. Then if they use the gas all hell can break loose. People panic and start running every which way and people could get trampled. Not to mention innocent people could end up getting gassed. The stuff is a mess. Clearing out protesters is almost a no win deal for the cops. No matter how they do it someone will be angry so they often try to do it in the way that they feel can best allow them to keep control of the situation.
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