Kernrechtsfrage
Whether the appeal against detention pending removal remained admissible after the appellant's departure from Switzerland.
Extrahierter Entscheid
The appeal became moot because the removal ended the administrative detention, and no exceptional circumstances justified a merits review despite lack of current interest.
Extrahierte Begründung
Once the appellant had left Switzerland, the detention under review had ended. He therefore lacked a current, practical interest in the appeal, and the file disclosed no special reason to depart from the strict mootness rule.