57However, if, in exceptional cases, a national authority opposes precise and full disclosure to the person concerned of the grounds which constitute the basis of a decision taken under Article 27 of Directive 2004/38, by invoking reasons of State security, the court with jurisdiction in the Member State concerned must have at its disposal and apply techniques and rules of procedural law which accommodate, on the one hand, legitimate State security considerations regarding the nature and sources of the information taken into account in the adoption of such a decision and, on the other hand, the need to ensure sufficient compliance with the person’s procedural rights, such as the right to be heard and the adversarial principle (see, by analogy, Kadi and Al Barakaat International Foundation v Council and Commission, paragraph 344).
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