National law should set a maximum period of detention that allows the competent national authorities to take all the necessary measures to enforce the return decision, hence to finalise the necessary procedures for successfully returning illegally staying third-country nationals and securing readmission in the third country of return.
La vérification de l'existence d'un séjour irrégulier peut, elle aussi, se révéler complexe, notamment lorsque l'intéressé invoque un statut de demandeur d'asile ou de réfugié.