48Although the proper functioning of the Common European Asylum System requires, in practice, that the competent national authorities have at their disposal reliable information relating to the identity or nationality of the applicant for international protection and to the elements on which his application is based, that provision cannot justify detention measures being decided without those national authorities having previously determined, on a case-by-case basis, whether they are proportionate to the aims pursued. Such a determination involves ensuring that all of the conditions referred to in paragraphs 44 to 46 of the present judgment are satisfied and, in particular, that, in each individual case, detention is used only as a last resort. Moreover, it must be ensured that that detention does not exceed, in any case, as short a period as possible.
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