It is now settled law, that it is the primary responsibility of the trial court which saw and heard witnesses to evaluate the evidence and pronounce on their credibility or probative value and not the appellate court which neither heard the witnesses nor saw them to observe their demeanors in the witness box. It follows therefore that when a trial court unquestionably evaluates the evidence and appraises the facts of a case, it is not the business of the appellate court to substitute its own views for the views of the trial court. – Musdapher JSC. Gbadamosi v. Dairo (2007)
APPEAL COURT: WHERE FURTHER EVIDENCE WILL BE NECESSARY
A situation where further evidence will be necessary arises only when the evidence relevant to the issue in controversy to determine an issue and ensure substantial justice is absent and deplete from the proceedings. This court or the court below does not ordinarily go out of its way to fish for evidence to fill a vacuum that does not exist in a case, just to satisfy a party, when in fact all the pleadings and evidence, that are necessary material are already part of the record of proceedings before it.
– Mukhtar JSC. Goodwill v. Witt (2011) – SC. 266/2005