34The Commission does not dispute that a Member State may lay down rules on the authorisation of laboratory activities, but maintains that such rules must nevertheless take account of the requirements and guarantees already satisfied in the Member State of establishment. If that were not the case, the failure to take account of the guarantees already satisfied in another Member State would run counter to the principle of proportionality, which requires that the objectives pursued must be achieved by less restrictive measures (see, to that effect, Case 279/80 Webb [1981] ECR 3305, paragraph 20, and Case C-106/91 Ramrath [1992] ECR I-3351, paragraph 31).
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