74Finally, with regard to a situation such as that in the main proceedings, in which a decision has been taken by the competent authorities of the host Member State to expel a Turkish national after his conviction there for several offences under national legislation, it must be pointed out that it is Article 14(1) of Decision 1/80 which establishes the relevant legal framework authorising the Member States to take the necessary measures. Those authorities are, however, obliged to assess the personal conduct of the offender and whether it constitutes a present, genuine and sufficiently serious threat to public policy and security, and in addition they must observe the principle of proportionality (see, to that effect, Nazli, paragraphs 57 to 61, and, by analogy, Case C-100/01 Oteiza Olazabal [2002] ECR I-10981, paragraphs 39, 43 and 44). In particular, a measure ordering expulsion based on Article 14(1) of that decision may be taken only if the personal conduct of the person concerned indicates a specific risk of new and serious prejudice to the requirements of public policy. Consequently, such a measure cannot be ordered automatically following a criminal conviction and with the aim of general deterrence (see Case C-383/03 Dogan [2005] ECR I-6237, paragraph 24).
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