Question juridique clé
Whether the appeal should succeed on the alleged violation of the right to be heard.
Solution extraite
The complaint failed because the cantonal court could, without arbitrariness, refuse the requested evidence as irrelevant or unnecessary.
Motifs extraits
Anticipatory assessment of evidence is allowed under Art. 29 para. 2 Cst.; the appellants did not show arbitrariness in the refusal of file production, site inspection, witness, or expert evidence.