Lack of study and oversight raises concerns about tear gas
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FILE - In this July 26, 2020, file photo, federal officers launch tear gas at demonstrators during a Black Lives Matter protest at the Mark O. Hatfield U.S. Courthouse in Portland, Ore. The Associated Press found that there is no government oversight of the manufacture and use of tear gas. Instead, the industry is left to regulate itself. (AP Photo/Marcio Jose Sanchez, File)