Key legal question
Whether retroactive collection of telephone traffic metadata under Art. 273 StPO was admissible despite subsidiarity objections.
Extracted holding
The subsidiarity requirement was satisfied; in a serious suspected felony, the threshold for subsidiarity is not high, and the less intrusive nature of metadata collection justified the measure.
Extracted reasoning
The alternative route via telecom customer data under FMG/FDV would not reveal the caller, the victim's whereabouts, or mobile location; it was therefore not an effective substitute. Given the suspected serious violent crime, preserving available evidence outweighed the limited intrusion.