Kernrechtsfrage
Whether the cantonal judgment had to be annulled because one lay judge on the social insurance chamber was no longer eligible and the court was irregularly composed.
Extrahierter Entscheid
The cantonal court sat in an unlawful composition because one assesseur no longer met the eligibility requirements; the judgment had to be annulled and the case remitted for a new decision by a properly composed court.
Extrahierte Begründung
The Federal Court examines ex officio whether the first-instance proceedings were formally valid, including proper composition. Under Art. 30(1) Cst., a tribunal must be established by law; irregular composition of a judicial authority is a ground of annulment. Since the judge had been domiciled in Vaud since 30 November 2010 and no longer satisfied Geneva eligibility requirements, the composition was irregular.