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The social international practice of contemporary international law does not correspond entirely to the one of the establishment of the icj. The world as to 1945 is definitely not the same of the 21st century. Such reality, has undoubtedly transformed international law and its vertebral components. That transformation includes the theory of the sources as a whole and all its kinds. From that perspective, the present research aims to revisit the traditional concept of customary international law by deciphering its two ingredients, in particular that of opinio juris, which will be tested by using contemporary scholarship and jurisprudence. After explaining some of the major difficulties of the classic concept of opinio juris, there will be a description of newer, contemporary and updated concepts. The foregoing will lead the discussion to demonstrate, whether it is in fact required to develop the classic definition of opinio juris, and whether it is suggested that it may be the only ingredient required in the recipe of contemporary customary international law.

Fabián Augusto Cárdenas Castañeda, Pontificia Universidad Javeriana

Abogado (Diploma de Honor) y especialista de la Universidad Nacional de Colombia; llm en Derecho Internacional Público de la Universidad de Leiden (Países Bajos); doctorando en Ciencias Jurídicas. Miembro del Centro de Estudios de Derecho Internacional Francisco
Suárez S.J. de la Pontificia Universidad Javeriana; miembro fundador de la Academia Colombiana de Derecho Internacional y editor general de su blog Debate Global; miembro del Grupo de Investigación en Responsabilidad Internacional y Medio Ambiente de la Sociedad
Latinoamericana de Derecho Internacional; docente de Derecho Internacional en diversas universidades.

Oscar Orlando Casallas Méndez, Universidad de la Sabana

Abogado de la Universidad Nacional de Colombia y estudiante de Maestría en Derecho
Internacional de la Universidad de La Sabana. Correo electrónico: oocasallasm@unal.edu.co

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Casos

Asylum (Perú vs. Colombia), ICJ, fallo del 20 de noviembre de 1950.

Barcelona Traction Company (Bélgica vs. España), ICJ, fallo del 5 de febrero de 1970.

Continental Shelf (Malta vs. Libya), ICJ, fallo del 3 de junio de 1985.

Fisheries (Reino Unido de la Gran Bretaña vs. Noruega), ICJ, fallo del 18 de diciembre de 1951.

Lotus (Francia vs. Turquía), ICPJ, fallo del 7 de septiembre de 1927.

Military and Paramilitary Activities in Nicaragua (Nicaragua vs. EE. UU.), ICJ, fallo del 27 de junio de 1986.

North Sea Continental Shelf (República Federal Alemana vs. Alemania/Dinamarca), ICJ, fallo del 20 de febrero de 1969.

Pulp Mills (Argentina vs. Uruguay), ICJ, fallo del 20 de abril de 2010.

Right of Passage over Indian Territory (Portugal vs. Indica), ICJ, fallo del 12 de abril de 1960.

South West Africa (Etiopía vs. Sudáfrica), CIJ, fallo del 18 de julio de 1966.

Trail Smelter Arbitration (U.S. vs. Can.) March 1941, Reports of International Arbitration Awards, UN, 2006.

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