Question juridique clé
Whether the appeal should succeed because the cantonal court wrongly refused to order a new expert report.
Solution extraite
The refusal was not arbitrary and did not violate the right to be heard; the existing expert report was sufficiently clear and no additional evidence was required.
Motifs extraits
The cantonal court could rely on the report as complete, comprehensible, and consistent. The appellants failed to show concrete arbitrariness, and a party has no right to further evidence when the court reasonably considers additional proof incapable of altering its conviction.