18It is settled case-law that the public policy exception constitutes a derogation from the right of residence of Union citizens and their family members, which must be interpreted strictly and the scope of which cannot be determined unilaterally by the Member States (see, to that effect, judgments of 4 December 1974, van Duyn, 41/74, EU:C:1974:133, paragraph 18; of 27 October 1977, Bouchereau, 30/77, EU:C:1977:172, paragraph 33; of 29 April 2004, Orfanopoulos and Oliveri, C‑482/01 and C‑493/01, EU:C:2004:262, paragraph 65; and of 13 September 2016, Rendón Marín, C‑165/14, EU:C:2016:675, paragraph 58).
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