Whether the cantonal investigating judge and the entire body of investigating judges had to recuse themselves because a complaint was filed against them or their hierarchical superior.
Yes. An objective appearance of partiality arose because no investigating judge could handle a criminal complaint directed against his hierarchical superior without compromising impartiality.
Recusal is required where relations with a party create an appearance of bias. Given the collegial and hierarchical links within the investigating judiciary, the complaint had to be handled by an ad hoc judge.