188Although the objective of preventing terrorism pursued by the national legislation at issue in the main proceedings is liable, given its importance, to justify interference in the form of the real-time collection of traffic and location data, such a measure may be implemented, taking into account its particularly intrusive nature, only in respect of persons with respect to whom there is a valid reason to suspect that they are involved in one way or another in terrorist activities. With regard to persons falling outside of that category, they may only be the subject of non-real-time access, which may occur, in accordance with the Court’s case-law, only in particular situations, such as those involving terrorist activities, and where there is objective evidence from which it can be deduced that that data might, in a specific case, make an effective contribution to combating terrorism (see, to that effect, judgment of 21 December 2016, Tele2, C‑203/15 and C‑698/15, EU:C:2016:970, paragraph 119 and the case-law cited).
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