30However, the possibility of a Member State relying on a derogation laid down by the Treaty does not prevent judicial review of measures applying that derogation (Case 41/74 Van Duyn [1974] ECR 1337, paragraph 7). In addition, the concept of ‘public policy’ in the Community context, particularly as justification for a derogation from the fundamental principle of the freedom to provide services, must be interpreted strictly, so that its scope cannot be determined unilaterally by each Member State without any control by the Community institutions (see, by analogy with the free movement of workers, Van Duyn, paragraph 18; Case 30/77 Boucher eau [1977] ECR 1999, paragraph 33). Thus, public policy may be relied on only if there is a genuine and sufficiently serious threat to a fundamental interest of society (Case C-54/99 Église de Scientologie [2000] ECR I-1335, paragraph 17).
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