Key legal question
Whether the complaint to the cantonal supervisory authority was proven to have been filed within the 10-day statutory deadline.
Extracted holding
The proof of timely filing was not established; the filing date relied on by the appellants was unsupported.
Extracted reasoning
The decisive moment is deposit with the postal office, normally evidenced by the postal stamp. Based on postal collection times and the stamp date, it was not arbitrary to conclude that an alleged posting on 30 November could not have been stamped only on 3 December.