Question juridique clé
Whether the federal appeal against the detention decision remained admissible after the applicant's removal from Switzerland
Solution extraite
The appeal became moot because the detention had ended and no exceptional reason justified dispensing with the requirement of an current practical interest.
Motifs extraits
Review of detention concerns only the lawfulness of the deprivation of liberty. Once detention ends, the protected interest in reviewing it normally lapses; none of the exceptions for recurrent, hard-to-review issues applied here.