54In that regard, the Court has admittedly held that, in areas of prevention, investigation, detection and prosecution of criminal offences, only the objective of fighting serious crime is capable of justifying public authorities’ access to personal data retained by providers of electronic communications services which, taken as a whole, allow precise conclusions to be drawn concerning the private lives of the persons whose data is concerned (see, to that effect, Tele2 Sverige and Watson and Others, paragraph 99).
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