Questão jurídica principal
Whether the refusal to hear witness Z. violated the right to be heard
Decisão extraída
No. The appellate court could refuse the witness because the evidence already taken sufficiently clarified the facts and additional testimony would not alter the assessment.
Fundamentação extraída
Anticipatory evaluation of evidence is permissible where the court, without arbitrariness, is already convinced of the relevant facts; the defendant had earlier conceded the purchase himself.