Key legal question
Whether the cantonal court violated the right to be heard by refusing to re-hear requested witnesses and police officers.
Extracted holding
No violation was shown; the court could lawfully refuse further evidence because the existing record was sufficient and the request was not decisive for the outcome.
Extracted reasoning
The witnesses had already been heard during the investigation with defense participation, and the appellant did not show that credibility depended on direct observation. The police reports and technical data provided enough basis for the findings.