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Tear gas and other chemical weapons used on crowds could cause health problems to both agents and protestors. <\/span>Sean Bascom\/Anadolu via Getty<\/span><\/p>\n<\/div>\n On January 31,<\/span> federal agents fired tear gas into a crowd of civilians, clergy, and children gathered outside the ICE building in Portland, Oregon. Witnesses say<\/a>, and video shows, that the demonstration was largely peaceful before the gas was deployed. In the weeks since, a federal judge moved to restrict the use of these chemical munitions at the site following reports that agents used them against demonstrators who posed no imminent threat<\/a>.<\/p>\n