Key legal question
Whether the cantonally defined offence under § 160 BauG/AG was applied in violation of the legality principle
Extracted holding
No. § 160 BauG/AG is a blanketing criminal norm, and the permit condition made the prohibited conduct sufficiently clear.
Extracted reasoning
The offence derives its concrete content from the building permit; using machines without filters plainly breached that permit condition. The Federal Court reviewed only for arbitrariness and found none.