I think I've only ever heard the rather euphemistic term "used," as in, "The police used tear gas canisters to disperse the crowd."
According to this, the police use either grenades or aerosol cans. If the cans, you could say, "The police sprayed tear gas at the demonstrators," but for the grenade, I guess you would say, "The police lobbed tear gas grenades into the crowd."
[not a teacher]
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