Chemical weapons use in Syria and Iraq continues despite the existence of a taboo against such weapons, the 1925 Geneva Protocol prohibiting the use of chemical and biological weapons, and the 1993 Chemical Weapons Convention that seeks a world free of chemical weapons via verified disarmament. Use has been confirmed by a joint United Nations Security Council and Organisation for the Prohibition of Chemical Weapons international investigation team, and the perpetrators identified in three cases. Both the Government of Syria and the Islamic State In Iraq and Syria (ISIS) have been identified as using chemical weapons, and the open source literature points to other non-state actors as possibly having used chemical weapons.