Question juridique clé
Whether the cantonal court arbitrarily found that the appellant knowingly used unsuitable material for concrete production.
Solution extraite
No. The cantonal court could rely on the judicial expert and the evidence that the material quality was defective and readily detectable; the appellant failed to show arbitrariness.
Motifs extraits
Arbitrariness requires a manifestly untenable assessment. The appellant did not demonstrate that the ignored circumstances were legally relevant or that the cantonal court disregarded decisive evidence without reason.