Quote

"Whenever a limitation is required in the terms of the Covenant to be "necessary," this term implies that the limitation: a.) is based on one of the grounds justifying limitations recognized by the relevant article of the Covenant, b.) responds to a pressing public or social need, c.) pursues a legitimate aim, and d.) it is proportionate to that aim."

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UN (ECOSOC): Siracusa Principles on the Limitation and Derogation of Provisions in the International Covenant on Civil and Political Rights, para. A.10

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Siracusa Principles on the Limitation and Derogation of Provisions in the International Covenant on Civil and Political Rights

Summaries

Measures derogating from provisions of the covenant must be of a temporary and exceptional nature and strictly required by the exigencies of the situation.