Now it is settled law that the evidence of a witness taken in an earlier proceeding is not relevant in a later trial. except for the purpose of discrediting such a witness in cross-examination and for that purpose only.
– Kawu, JSC. Ogunnaike v. Ojayemi (1987)
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Once a piece of evidence is relevant, it is admissible in evidence irrespective of how it was obtained.
– M.L. Garba JCA. Odogwu v. Vivian (2009) – CA/PH/345/05
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
The class of witnesses described as expert witnesses is well settled. It is imperative to state that every piece of evidence that has been admitted in the course of proceedings is subject to be tested for credibility, weight or cogency by the trial court before it becomes acceptable. In effect it is not merely acceptable because the witness is described as an expert and his evidence not challenged. The primary duty of the trial court is to evaluate the evidence before it is accepted whether given by an expert or not.
– Nwodo, JCA. OLAM v. Intercontinental Bank (2009)
Saleh v. B.O.N. Ltd (2006) NWLR (Pt. 976) 316 at 326-327 thus: “A company is a juristic person and can only act through its agents or servants. Consequently, any agent or servant can give evidence to establish any transaction entered into by a juristic personality. Even where the official giving the evidence is not the one who actually took part in the transaction on behalf of the company. Such evidence is nonetheless relevant and admissible and will not be discountenanced or rejected as hearsay evidence…”
In the case of Olukade v Alade (1976) 2 SC 183, this Court summarised the general rule on the effect of the admission of inadmissible evidence:- “A court is expected in all proceedings before it to admit and act only on evidence which is admissible in law (i.e. under the Evidence Act or any other law or enactment relevant in any particular case or matter) and so if the court should inadvertently admit inadmissible evidence it has the duty not to act upon it.”
It seems to me that if under the provisions of Order 23, rule 54 of the High Court Rules of Anambra State, 1988 a Magistrate or any officer of the court is permitted to take the evidence of a witness by way of commission, it cannot, with respect, be right to suggest that a High Court Judge, a judicial officer with much higher jurisdiction and status than a Magistrate or any other officer of the court is incompetent to take such evidence unless there exists any law which stipulates to the contrary. I know of no such law and my attention has not been drawn to any in this appeal. I am therefore of the view that the High Court was right by taking the evidence of the fourth defendant by way of commission as urged upon the court by learned Counsel for the appellant.
— Iguh JSC. Chime v Chime (2001) – SC 179/1991
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