Tear gas
The use of tear gas also has problems: Usually, cartidges of tear gas are thrown; they can hit and injure people. A case of serious injury to the blood vessels from tear gas shells has also been reported from Iran, with high rates of associated nerve injury (44%) and amputation (17%), as well as instances of head injuries in young people. Directly exposing skin to tear gas may lead to chemical burns and allergic reactions of the skin.