Key legal question
Whether the Federal Migration Office's appeal against the cantonal detention decision was still admissible and reviewable.
Extracted holding
The appeal was inadmissible because the removal procedure had already been successfully completed and the dispute no longer presented a current, concrete legal issue.
Extracted reasoning
The Court held that the authority's complaint function is limited to concrete cases with significance beyond the individual case. Here, the detention had already served its purpose, the respondent had complied with reporting obligations, and he had been transferred to Italy, so only an abstract legal question remained.