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The substance of customary rules of international law is to be found primarily in the 'actual practice'…

Opinio juris, the subjective element of custom, is the "Psychological Element": the conviction that a practice is followed out of a sense of legal obligation.

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The substance of customary rules of international law is to be found primarily in the 'actual practice' and the 'opinio juris' of the States, sometimes referred to as the objective and the subjective elements of the custom respectively. Here the opinio juris, that renders the custom obligatory between the nations, implies:—

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Opinio juris, the subjective element of custom, is the "Psychological Element": the conviction that a practice is followed out of a sense of legal obligation.

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