Question juridique clé
Whether the appeal against the administrative detention order still had an object after the appellant left Switzerland.
Solution extraite
The appeal had become moot because the purpose of reviewing the detention order had fallen away after the appellant's departure.
Motifs extraits
The Service de la population confirmed that the detainee left Switzerland on 19 December 2016; therefore the request to lift the administrative detention no longer had any practical object and the court took note of that situation.