Questão jurídica principal
Whether refusing production of a separate file concerning witness Z. violated the right to be heard.
Decisão extraída
No. The requested evidence could not change the assessment, given that the court already knew of Z.'s drug addiction and the appellant failed to show any additional relevant fact the file could establish.
Fundamentação extraída
A court may refuse evidence that is irrelevant or incapable of affecting the outcome; the cantonal court assessed Z.'s credibility with knowledge of his drug use and the separate investigation would not have altered that assessment.