23While Member States essentially retain the freedom to determine the requirements of public policy and public security in accordance with their national needs, which can vary from one Member State to another and from one era to another, particularly as justification for a derogation from the fundamental principle of free movement of persons, those requirements must nevertheless be interpreted strictly, so that their scope cannot be determined unilaterally by each Member State without any control by the institutions of the European Union (see, inter alia, Case C-33/07 Jipa [2008] ECR I-5157, paragraph 23; C-430/10 Gaydarov [2011] ECR I-11637, paragraph 32; and Case C-434/10 Aladzhov [2011] ECR I-11659, paragraph 34).
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