Question juridique clé
Whether the state constitutional complaint against the cantonal return order was admissible and what review applied.
Solution extraite
The constitutional complaint was admissible because no ordinary appeal lay; treaty violations were reviewed freely, while factual findings were reviewed only for arbitrariness and new facts were inadmissible.
Motifs extraits
Return proceedings under the Hague Convention are treated as administrative mutual assistance, not a civil dispute. Therefore, constitutional review was the proper remedy.