Author: Odile Ammann

[Odile Ammann is a postdoctoral researcher at the University of Zurich, Switzerland.] “Customary international law cannot be interpreted because it’s not written.” I have heard this objection many times, including from the most seasoned international lawyers. While the interpretability of customary international law (CIL) may seem less obvious than that of written laws, I do not think that the written or unwritten character of a legal...

[Odile Ammann is a PhD candidate at the University of Fribourg, Switzerland and a visiting researcher at the University of Oxford. Benedikt Pirker is a Senior Lecturer (Maître d’enseignement et de recherche) at the University of Fribourg, Switzerland, where he teaches and does research in international law and EU law.] In his Opinio Juris blogpost of November 3, Julian Ku contends that...