Questão jurídica principal
Whether the appeal should succeed on the alleged violation of the right to be heard.
Decisão extraída
The complaint failed because the cantonal court could, without arbitrariness, refuse the requested evidence as irrelevant or unnecessary.
Fundamentação extraída
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.