82Furthermore, measures on grounds of public policy or public security may be taken only following a case-by-case assessment by the competent national authorities showing that the personal conduct of the individual concerned constitutes at present a genuine and sufficiently serious threat to a fundamental interest of society. In that assessment, those authorities are also required to observe both the principle of proportionality and the fundamental rights of the person concerned, in particular, the right to privacy and family life (see, to that effect, Case C-303/08 Bozkurt, paragraphs 57 to 60 and the case-law cited).
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