Question juridique clé
Whether the federal appeal against the cantonal recusal decision was admissible.
Solution extraite
The appeal was admissible in principle as a separately appealable interim decision on recusal, but only insofar as properly substantiated constitutional and ECHR grievances were raised.
Motifs extraits
A recusal ruling on an investigating judge is an independent interim decision that cannot later be challenged; constitutional review is limited to sufficiently substantiated grounds.