77For the purposes of deciding whether a national of another Member State may be expelled under the exception based on reasons of public policy, the competent national authorities must assess, on a case-by-case basis, whether the measure or the circumstances which gave rise to that expulsion order prove the existence of personal conduct constituting a present threat to the requirements of public policy (see, in particular, Calfa, cited above, paragraph 22). As the Advocate General points out in point 126 of her Opinion, no more specific information as to what constitutes the ‘presence’ of the threat is evident from the wording of Article 3 of Directive 64/221 or the Court's case-law.
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