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)
COURT TO DECIDE CASE ONLY ON LEGALLY ADMISSIBLE EVIDENCE
Thus where a court wrongfully admits inadmissible evidence, it ought as a duty, to disregard the inadmissible evidence in the consideration of the judgment in the matter. Where such evidence has been wrongfully admitted and acted upon and whether or not the opposing party objects or not, an appellate court has the duty to exclude such evidence and decide the case only on the legally admissible evidence, see Timitimi v Amabebe (1953) 14 WACA 374; Ajayi v Fisher (1956) 1 FSC 90, (1956) SC NLR 279.
— Musdapher, JSC. Shittu & Ors. v Fashawe [2005] – SC 21/2001