148As regards the limits to which such a data retention measure must be subject, these may, in particular, be determined according to the categories of persons concerned, since Article 15(1) of Directive 2002/58 does not preclude legislation based on objective evidence which makes it possible to target persons whose traffic and location data is likely to reveal a link, at least an indirect one, with serious criminal offences, to contribute in one way or another to combating serious crime or to preventing a serious risk to public security or a risk to national security (see, to that effect, judgment of 21 December 2016, Tele2, C‑203/15 and C‑698/15, EU:C:2016:970, paragraph 111).
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