As readers of the blog no doubt know,
Syria is is one of seven states that have not ratified the Chemical Weapons Convention (CWC). (The others are Angola, Egypt, Israel, Myanmar, North Korea, and South Sudan.) To consider
Syria’s use of chemical weapons as a rationale for attacking the country, the USG obviously needs to assume that the use of such weapons is prohibited by customary international law. I have no doubt that they are; after all, the CWC has been ratified by 96% of the world’s states, and nearly...