Kernrechtsfrage
Whether the cantonal court arbitrarily construed the reformatio in peius ban under § 236(2) StPO/LU by allowing a work-education measure after the defendant alone appealed.
Extrahierter Entscheid
The cantonal court's interpretation was tenable and not arbitrary; the constitutional complaint failed.
Extrahierte Begründung
The cantonal rule expressly covered only punishment and not measures. Under the measure's bettering purpose, the appellate court could treat the new measure as outside the prohibition, and the defendant's alternative view was not enough to establish arbitrariness.