This Policy Forum issue, a continuation of Policy Forum No. 2, will examine the CW attacks that the Islamic State allegedly carried out in Syria and Iraq. It will argue that there is sufficient evidence that this group has developed a rudimentary chemical weapons capability and has used sulfur mustard in Syria. This article will also contextualize the threat posed by the Islamic State’s CW capability by comparing it to the threat posed by other state and non-state actors’ deployment of this category of weapons. The Policy Forum issue will then evaluate the future threat posed by the Islamic State’s use of CW in and outside the Middle East. Finally, this article briefly offers policy solutions to minimize the threat posed by this terrorist group. 

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