Can a trial judge overturn a finding that lay opinion evidence is relevant to the trial?

The trial judge's decisions with regard to admission of lay opinion evidence cannot be disturbed absent clear abuse of discretion. United States v. Barrett, 703 F.2d 1076, 1086 (9th Cir.1983). Likewise, the trial judge's decisions on relevancy of evidence are matters for his exercise of discretion, and cannot be reversed unless inconsistent with substantial justice. The trial judge and jurors in the Northern Mariana Islands plainly know much more than we do about those details of life and work there which make facts more or less probative of the propositions at issue in the trial.