Whether the refusal to hear additional alibi witnesses violated the duty to investigate, the right to be heard, or was arbitrary
No. The lower court could, without arbitrariness, conclude that hearing the witnesses would not change the result and could therefore deny the evidentiary request.
The court found the identification evidence strong and the alibi vague and late-raised. It held that anticipated appreciation of evidence is permissible when further evidence could not alter the court's conviction.