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Belgian prosecutor explains to Spanish judge the refusal to extradite Catalan politician: fundamental rights at risk of being violated by extradition. Specifically, rights to effective judicial protection, impartial judge, and presumption of innocence. elnacional.cat/en/politics/belgian-prosecutor-spanish-judge-llarena-puig-basic-rights_581397_102.html
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The Belgian prosecutor didn't appeal the decision to a higher court because: - the case would not be viable either from a technical or legal point of view - the Spanish Supreme Court is not the court which has competence to try their case
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Belgium also accepted as "valid" the complaint made by the UN Working Group on Arbitrary Detention that there is a "serious, real, concrete and individual risk of violation of fundamental rights."