6) Article 1 of the Charter of Fundamental Rights of the European Union (‘the Charter’), headed ‘Human dignity’, states: ‘Human dignity is inviolable. It must be respected and protected.’

7) Article 4 of the Charter, headed ‘Prohibition of torture and inhuman or degrading treatment or punishment’, states: ‘No one shall be subjected to torture or to inhuman or degrading treatment or punishment.’

8) The Explanations relating to the Charter of Fundamental Rights (OJ 2007 C 303, p. 17; ‘the Explanations relating to the Charter’) state that ‘[t]he right in Article 4 [of the Charter] is the right guaranteed by Article 3 of the ECHR which has the same wording … By virtue of Article 52(3) of the Charter, it therefore has the same meaning and the same scope as the ECHR Article’.

9) Article 6 of the Charter, headed ‘Right to liberty and security’, provides: ‘Everyone has the right to liberty and security of person.’

10) Article 48(1) of the Charter, that article being headed ‘Presumption of innocence and rights of defence’, provides: ‘Everyone who has been charged shall be presumed innocent until proved guilty according to law.’

11) Article 51(1) of the Charter, that article being headed ‘Field of application’, provides: ‘The provisions of this Charter are addressed to the institutions, bodies, offices and agencies of the Union with due regard for the principle of subsidiarity and to the Member States only when they are implementing Union law. …’

12) Article 52(1) of the Charter, that article being headed ‘Scope and interpretation of rights and principles’, provides: ‘Any limitation on the exercise of the rights and freedoms recognised by this Charter must be provided for by law and respect the essence of those rights and freedoms. Subject to the principle of proportionality, limitations may be made only if they are necessary and genuinely meet objectives of general interest recognised by the Union or the need to protect the rights and freedoms of others.’

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74) By its questions, which can be examined together, the referring court seeks, in essence, to ascertain whether Article 1(3) of the Framework Decision must be interpreted as meaning that, where there is solid evidence that detention conditions in the issuing Member State are incompatible with fundamental rights, in particular with Article 4 of the Charter, the executing judicial authority may or must refuse to execute a European arrest warrant issued in respect of a person for the purposes of conducting a criminal prosecution or executing a custodial sentence, or whether it may or must make the surrender of that person conditional on there being obtained from the issuing Member State information enabling it to be satisfied that those detention conditions are compatible with fundamental rights. Further, the referring court seeks to ascertain whether Articles 5 and 6(1) of the Framework Decision must be interpreted as meaning that such information may be supplied by the judicial authority of the issuing Member State or whether the supply of that information is governed by the domestic rules of competence in that Member State.

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77) The principle of mutual recognition on which the European arrest warrant system is based is itself founded on the mutual confidence between the Member States that their national legal systems are capable of providing equivalent and effective protection of the fundamental rights recognised at EU level, particularly in the Charter (see, to that effect, judgment in F., C‑168/13 PPU, EU:C:2013:358, paragraph 50, and, by analogy, with respect to judicial cooperation in civil matters, the judgment in Aguirre Zarraga, C‑491/10 PPU, EU:C:2010:828, paragraph 70).

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83) Second, as is stated in Article 1(3) thereof, the Framework Decision is not to have the effect of modifying the obligation to respect fundamental rights as enshrined in, inter alia, the Charter.

84) In that regard, it must be stated that compliance with Article 4 of the Charter, concerning the prohibition of inhuman or degrading treatment or punishment, is binding, as is stated in Article 51(1) of the Charter, on the Member States and, consequently, on their courts, where they are implementing EU law, which is the case when the issuing judicial authority and the executing judicial authority are applying the provisions of national law adopted to transpose the Framework Decision (see, by analogy, judgments in Dereci and Others, C‑256/11, EU:C:2011:734, paragraph 72, and Peftiev and Others, C‑314/13, EU:C:2014:1645, paragraph 24).

85) As regards the prohibition of inhuman or degrading treatment or punishment, laid down in Article 4 of the Charter, that prohibition is absolute in that it is closely linked to respect for human dignity, the subject of Article 1 of the Charter (see, to that effect, judgment in Schmidberger, C‑112/00, EU:C:2003:333, paragraph 80).

86) That the right guaranteed by Article 4 of the Charter is absolute is confirmed by Article 3 ECHR, to which Article 4 of the Charter corresponds. As is stated in Article 15(2) ECHR, no derogation is possible from Article 3 ECHR.

87) Articles 1 and 4 of the Charter and Article 3 ECHR enshrine one of the fundamental values of the Union and its Member States. That is why, in any circumstances, including those of the fight against terrorism and organised crime, the ECHR prohibits in absolute terms torture and inhuman or degrading treatment or punishment, irrespective of the conduct of the person concerned (see judgment of the ECtHR in Bouyid v. Belgium, No 23380/09 of 28 September 2015, § 81 and the case-law cited).

88) It follows that, where the judicial authority of the executing Member State is in possession of evidence of a real risk of inhuman or degrading treatment of individuals detained in the issuing Member State, having regard to the standard of protection of fundamental rights guaranteed by EU law and, in particular, by Article 4 of the Charter (see, to that effect, judgment in Melloni, C‑399/11, EU:C:2013:107, paragraphs 59 and 63, and Opinion 2/13, EU:C:2014:2454, paragraph 192), that judicial authority is bound to assess the existence of that risk when it is called upon to decide on the surrender to the authorities of the issuing Member State of the individual sought by a European arrest warrant. The consequence of the execution of such a warrant must not be that that individual suffers inhuman or degrading treatment.

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94) Consequently, in order to ensure respect for Article 4 of the Charter in the individual circumstances of the person who is the subject of the European arrest warrant, the executing judicial authority, when faced with evidence of the existence of such deficiencies that is objective, reliable, specific and properly updated, is bound to determine whether, in the particular circumstances of the case, there are substantial grounds to believe that, following the surrender of that person to the issuing Member State, he will run a real risk of being subject in that Member State to inhuman or degrading treatment, within the meaning of Article 4.

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100) Further, in accordance with Article 6 of the Charter, the executing judicial authority may decide to hold the person concerned in custody only in so far as the procedure for the execution of the European arrest warrant has been carried out in a sufficiently diligent manner and in so far as, consequently, the duration of the detention is not excessive (see, to that effect, judgment in Lanigan, C‑237/15 PPU, EU:C:2015:474, paragraphs 58 to 60). The executing judicial authority must give due regard, with respect to individuals who are the subject of a European arrest warrant for the purposes of prosecution, to the principle of the presumption of innocence guaranteed by Article 48 of the Charter.

101) In that regard, the executing judicial authority must respect the requirement of proportionality, laid down in Article 52(1) of the Charter, with respect to the limitation of any right or freedom recognised by the Charter. The issue of a European arrest warrant cannot justify the individual concerned remaining in custody without any limit in time.

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104) It follows from all the foregoing that the answer to the questions referred is that Article 1(3), Article 5 and Article 6(1) of the Framework Decision must be interpreted as meaning that where there is objective, reliable, specific and properly updated evidence with respect to detention conditions in the issuing Member State that demonstrates that there are deficiencies, which may be systemic or generalised, or which may affect certain groups of people, or which may affect certain places of detention, the executing judicial authority must determine, specifically and precisely, whether there are substantial grounds to believe that the individual concerned by a European arrest warrant, issued for the purposes of conducting a criminal prosecution or executing a custodial sentence, will be exposed, because of the conditions for his detention in the issuing Member State, to a real risk of inhuman or degrading treatment, within the meaning of Article 4 of the Charter, in the event of his surrender to that Member State. To that end, the executing judicial authority must request that supplementary information be provided by the issuing judicial authority, which, after seeking, if necessary, the assistance of the central authority or one of the central authorities of the issuing Member State, under Article 7 of the Framework Decision, must send that information within the time limit specified in the request. The executing judicial authority must postpone its decision on the surrender of the individual concerned until it obtains the supplementary information that allows it to discount the existence of such a risk. If the existence of that risk cannot be discounted within a reasonable time, the executing judicial authority must decide whether the surrender procedure should be brought to an end.

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105) Since these proceedings are, for the parties to the main proceedings, a step in the action pending before the national court, the decision on costs is a matter for that court. Costs incurred in submitting observations to the Court, other than the costs of those parties, are not recoverable.

On those grounds, the Court (Grand Chamber) hereby rules:

Article 1(3), Article 5 and Article 6(1) of Council Framework Decision 2002/584/JHA of 13 June 2002 on the European arrest warrant and the surrender procedures between Member States, as amended by Council Framework Decision 2009/299/JHA of 26 February 2009, must be interpreted as meaning that, where there is objective, reliable, specific and properly updated evidence with respect to detention conditions in the issuing Member State that demonstrates that there are deficiencies, which may be systemic or generalised, or which may affect certain groups of people, or which may affect certain places of detention, the executing judicial authority must determine, specifically and precisely, whether there are substantial grounds to believe that the individual concerned by a European arrest warrant, issued for the purposes of conducting a criminal prosecution or executing a custodial sentence, will be exposed, because of the conditions for his detention in the issuing Member State, to a real risk of inhuman or degrading treatment, within the meaning of Article 4 of the Charter, in the event of his surrender to that Member State. To that end, the executing judicial authority must request that supplementary information be provided by the issuing judicial authority, which, after seeking, if necessary, the assistance of the central authority or one of the central authorities of the issuing Member State, under Article 7 of the Framework Decision, must send that information within the time limit specified in the request. The executing judicial authority must postpone its decision on the surrender of the individual concerned until it obtains the supplementary information that allows it to discount the existence of such a risk. If the existence of that risk cannot be discounted within a reasonable time, the executing judicial authority must decide whether the surrender procedure should be brought to an end.