the idea, to quote the ILC’s Draft Conclusions on Identification of Customary International
Law, that “[t]o determine the existence and content of a [primary] rule of customary international
law, it is necessary to ascertain whether there is a general practice that is accepted as
law.” “Put simply,” Hakimi insists, “the rulebook conception reflects what many people imagine CIL to be, but it does not describe what global actors use and receive as CIL in the everyday practice of
law. It does not reflect what CIL ‘is’ as a real-world sociological...