Tuesday, 31 March 2026

Detention by Delay? A Structural Paradox in EU Migration Law

 


 

Miguel Alconero Bravo, Predoctoral Research Fellow (Formación de Personal Investigador – FPI) at the University of Valladolid*

*Part of the Research Project “Proceso Penal y Espacio de Libertad, Seguridad y Justicia: Garantías, Cooperación Transfronteriza y Digitalización” (Ref. PID2023 – 152074NB – I00). 

Photo credit: berthgmn via wikimedia commons

 

Introduction

 

Predicating the detention of a migrant on circumstances entirely beyond his or her control seems prima facie unjust. Indeed, even a cursory reading of the provisions of EU law empowering Member States to extend the detention of a foreign national due to delays in obtaining the necessary documentation from third countries unmistakably exposes the inherent disproportionality of such a measure.

 

Ordering detention v. Extending detention

 

It must first be emphasised that both Article 15(6) of the Return Directive and Article 32(3) of the Commission proposal to overhaul EU return procedures enable Member States solely to extend a period of deprivation of liberty that has already been lawfully ordered.

 

Accordingly, where the conditions required under EU law for the detention of a third-country national are not satisfied in a given factual scenario, it is legally immaterial whether any of the grounds permitting a State to prolong that measure are present. If a person could not lawfully have been deprived of liberty from the outset, there is, fundamentally, no valid detention susceptible of being extended.

 

In this regard, Article 15(5) of the Return Directive states that “detention shall be maintained for as long a period as the conditions laid down in paragraph 1 are fulfilled and it is necessary to ensure successful removal”, whereas Article 32(1) of the proposal for a Return Regulation provides that “detention shall be maintained for as short a period as possible and for as long as the conditions laid down in Article 29 are fulfilled […]”.

 

Reference must therefore be made to Article 15(1) of the Return Directive, which adopts a numerus apertus approach. This provision refers in particular to two situations that may lead to the detention of a foreign national pending removal: the existence of a risk of absconding, and the possibility of identifying conduct through which the migrant seeks to avoid or hamper the preparation of return or the removal process.

 

Similarly, Article 29(3) of the proposed Regulation sets out, in exhaustive terms, the only situations in which the requesting State may order the detention of an irregularly staying third-country national: (a) where there is a risk of absconding determined in accordance with Article 30; (b) where the third-country national avoids or hampers the preparation of the return or the removal process; (c) where the third-country national poses security risks in accordance with Article 16; (d) in order to determine or verify his or her identity or nationality; (e) in the event of non-compliance with the measures ordered pursuant to Article 31.

 

Thus, the vast majority of the grounds for detention laid down in the Return Directive and in the proposed Regulation relate to scenarios in which the third-country national concerned has sought to frustrate the enforcement of return or the removal process. In essence, deprivation of liberty under both instruments is generally linked to some form of non-cooperation by the person concerned.

 

In this context, it must be stressed that construing the foreign national's lack of cooperation as a ground for extending detention – as Article 15(6)(a) of the Return Directive and Article 32(3) of the proposed Regulation do – makes it easier to postulate that the ground originally justifying detention still subsists. In other words, such a construction allows the authorities to establish the presence of almost any of the grounds set out in Article 15(1) of the return Directive and in Article 29(3) of the proposed Regulation for the purpose of ordering the detention of a migrant.

 

As a matter of fact, when a State invokes the “lack of cooperation by the third-country national concerned” in order to prolong detention, it is essentially relying on a concept whose indeterminacy allows national authorities to subsume within it many of the very grounds on which they could initially have relied to deprive that person of liberty.

 

In sum, extending the detention of a foreign national as a consequence of his or her lack of cooperation will, in most cases, make it possible to ascertain that the grounds for detention set out in EU law continue to be met.

 

Nonetheless, an exception must be made in respect of Articles 29(3)(c) and 29(3)(d) of the proposed Regulation –namely, where the person concerned is a third-country national deemed to pose a security risk, and where detention is ordered for the purpose of determining or verifying the foreign national’s identity or nationality.

 

In that respect, it should be noted that detention ordered on the grounds that a migrant poses a risk to public order, public security or national security bears, strictly speaking, no relation to the degree of cooperation he or she may have been willing to display during the return procedure. Irrespective of the individual’s willingness to cooperate, once a foreign national has been deprived of liberty on the basis that he or she is regarded as a threat to a State’s public order, public security or national security, detention will persist for as long as that classification remains in force.

 

That being so, authorities cannot invoke a migrant’s lack of cooperation to extend detention where the initial deprivation of liberty was based on security grounds or on the need to verify identity, as those circumstances do not, as such, relate to the individual’s conduct during the return procedure (unless a genuine and subsequent lack of cooperation actually materialises). Nevertheless, it is equally true that, in our view, Brussels errs in treating said situations as grounds for detention in the first place.

 

Against this backdrop, the pivotal question is as follows: under which of the grounds set out in either Article 15(1) of the Return Directive or Article 29(3) of the proposed Regulation could a Member State’s intention to prolong the detention of a third-country national be classified when that intention is based, purely and simply, on the likelihood that the procedure will take longer owing to delays in obtaining the required documentation from third countries?

 

As far as the Return Directive is concerned, the answer may lie in the numerus apertus structure of Article 15(1). Article 29(3) of the proposed Regulation, however, does not, under any circumstances, permit a third-country national to be deprived of liberty solely on the basis of delays in obtaining documents from third countries.

 

The conclusion follows inexorably. The wording of Article 32(3) of the proposed Regulation allowing deprivation of liberty to be prolonged “where the return procedure is likely to last longer owing to […] delays in obtaining the necessary documentation from third countries” ought to be removed. If EU law does not recognise the possibility of detaining a foreign national on that ground, it is a fortiori manifestly contrary to the principle of proportionality that such delays should then be relied upon to justify prolonging the duration of a custodial measure.

 

A structural contradiction

 

It must be acknowledged that both Article 32(3) of the proposed Return Regulation and Article 15(6)(b) of the Return Directive pursue an entirely legitimate aim: namely, to prevent, through the use of all available means, a situation in which enforcement of the return decision becomes impossible as a result of a temporary delay in receiving the necessary documentation from the requested State.

 

That said, it is crucial to recall that, in order for the detention of a third-country national to be prolonged, there must first exist a custodial measure resting on a valid legal basis. The analysis must therefore begin by determining whether in the factual circumstances of the case the substantive conditions laid down in EU law for depriving a migrant of liberty are actually satisfied.

 

Against this background, neither Article 15(1) of the Return Directive nor Article 29(3) of the proposed Regulation treats a mere delay in the completion of the administrative or diplomatic formalities necessary to obtain the required documentation from third countries as a circumstance capable of justifying an initial deprivation of liberty.

 

This gives rise to a stark legal contradiction: if EU law precludes the initial detention of a third-country national on the basis of administrative delays in obtaining the necessary documentation from third countries, why does Brussels permit its Member States to extend detention on that very ground? Although such delays cannot justify the initial deprivation of liberty, they may nonetheless serve to prolong the detention of a migrant.

 

The result is a structural paradox whereby a custodial measure that should come to an end from the moment the substantive conditions underpinning detention are no longer met is nevertheless lawfully prolonged by the requesting State under the provisions governing extension.

 

That tension becomes all the more striking when viewed in the light of other instruments of EU migration law. In particular, Article 11(1) of Directive 2024/1346 provides that “delays in administrative procedures that cannot be attributed to the applicant shall not justify a continuation of detention”.

 

For all these reasons, if the EU wished to preserve this ground for prolonging detention in the proposed Regulation, its express incorporation into Article 29(3)  as a ground, not just for extending, but also for ordering detention would be necessary.

 

As regards Directive 2008/115, the only interpretative solution would be to conclude that, by merely identifying the risk of absconding and the possibility that the individual may avoid or hamper the preparation of return as the two grounds that, in particular, entitle a State to deprive a migrant of liberty, that instrument implicitly leaves room for the authorities to rely on other situations as independent grounds for detention. One such additional scenario would be, precisely, delays in obtaining the necessary documentation from third countries.

 

However, both of those alternatives must be categorically rejected. Otherwise, the ultima ratio nature traditionally associated with the detention of an irregularly staying third-country national would be severely compromised.

 

In any event, the release of the individual concerned does not prevent the authorities from resorting to less restrictive measures designed to secure the enforcement of return pending receipt of the necessary documentation.

 

In this regard, Article 31 of the proposed Regulation explicitly provides for various alternatives to detention, which must be “proportionate to the level of the risk of absconding assessed in accordance with Article 30”. Furthermore, Article 23 of said proposal provides for a series of options which, by restricting the individual’s geographical mobility, are capable of ensuring his or her availability during the removal process.

 

Mahdi: When can detention be extended?

 

The Court of Justice of the European Union (CJEU) clarified in Mahdi the scope of the assessment that national courts must undertake before authorising any extension of a detention period on the basis of Article 15(6) of the Return Directive

 

In order to rule on the questions referred by the Administrativen sad Sofia-grad, the CJEU began by identifying the defining features of Article 15 of the Return Directive. It emphasised, in particular, that this provision is both “unconditional” and “sufficiently precise”, qualities which explain why its implementation by the Member States requires “no other specific elements”.

 

The Court then turned to the provisions whose interpretation had been requested by the referring court, namely Articles 15(3) and 15(6) of the Return Directive.

 

Concerning Article 15(3), the Court underlined the clarity with which its wording indicates that any detention measure prolonged over time must be subject to the “supervision” of a judicial authority. Yet the CJEU also acknowledged that the provision does not specify the precise nature of that examination, thereby making it necessary to “recall the rules deriving from Article 15 […]” in order to complete the analysis required by the question raised by the Bulgarian court.

 

It was at that stage that the Court brought Article 15(6) of Directive 2008/115 into the discussion.

 

Significantly, however, the CJEU did not confine itself to identifying the consequences flowing from the substantive conditions set out in that provision. Instead, it examined Article 15(6) in the light of Article 15(4) of the same Directive.

 

In so doing, the Court of Justice of the European Union introduced two decisive elements into the judicial review of the deprivation of liberty of an irregularly staying third-country national.

 

First, it held that, “at the time of the national court’s review of the lawfulness of

detention”, there must be “a real prospect that the removal can be carried out successfully”, having regard to the time limits laid down in Articles 15(5) and 15(6) of Directive 2008/115.

 

Secondly, the Court established that the authority determining whether the individual’s detention should be extended or whether he or she should be released must re-examine the substantive conditions laid down in Article 15(1) of the Return Directive. Crucially, this entails verifying that the grounds “which have formed the basis for the initial decision to detain the third-country national concerned” continue to subsist.

 

This point is of central importance to the present discussion, since Article 15(1) of the Return Directive makes no reference whatsoever to the possibility of detaining a foreign national solely on account of delays by third countries in issuing the necessary documentation. It follows that reliance on such a ground does not relieve the competent authorities of the burden of demonstrating, first, that there remains a “reasonable prospect of removal” and, secondly, that the substantive grounds which justified the initial deprivation of liberty continue to subsist.

 

The disappearance of either the reasonable prospect of removal or the substantive grounds that initially justified the detention of the third-country national necessarily renders that deprivation of liberty unlawful, as Article 15(4) of the Return Directive makes clear. That conclusion is not altered by the mere fact that the authorities continue to await the necessary documentation from other States.

 

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