Judgment of the Court (Grand Chamber) of 4 October 2024.#C.G. v Bezirkshauptmannschaft Landeck.#Request for a preliminary ruling from the Landesverwaltungsgericht Tirol.#Reference for a preliminary ruling – Protection of natural persons with regard to the processing of personal data by competent authorities for the purposes of the prevention, investigation, detection or prosecution of criminal offences – Directive (EU) 2016/680 – Article 3(2) – Concept of ‘processing’ – Article 4 – Principles relating to processing of personal data – Article 4(1)(c) – Principle of ‘data minimisation’ – Articles 7, 8, 47 and Article 52(1) of the Charter of Fundamental Rights of the European Union – Requirement that a limitation on the exercise of a fundamental right must be ‘provided for by law’ – Proportionality – Assessment of proportionality in the light of all the relevant factors – Prior review by a court or independent administrative authority – Article 13 – Information to be made available or given to the data subject – Limits – Article 54 – Right to an effective judicial remedy against a controller or processor – Police investigation in relation to narcotics trafficking – Attempt, by the police, to unlock a mobile telephone in order to gain access, for the purposes of that investigation, to the personal data stored in that telephone.#Case C-548/21.