140As regards the objective of preventing, investigating, detecting and prosecuting criminal offences, in accordance with the principle of proportionality, only action to combat serious crime and measures to prevent serious threats to public security are capable of justifying serious interference with the fundamental rights enshrined in Articles 7 and 8 of the Charter, such as the interference entailed by the retention of traffic and location data. Accordingly, only non-serious interference with those fundamental rights may be justified by the objective of preventing, investigating, detecting and prosecuting criminal offences in general (see, to that effect, judgments of 21 December 2016, Tele2, C‑203/15 and C‑698/15, EU:C:2016:970, paragraph 102, and of 2 October 2018, Ministerio Fiscal, C‑207/16, EU:C:2018:788, paragraphs 56 and 57; Opinion 1/15 (EU-Canada PNR Agreement) of 26 July 2017, EU:C:2017:592, paragraph 149).
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