A tainted witness falls into one or both of the two categories hereunder listed: (1) A witness who is an accomplice in the crime charged. (2) A witness who, by the evidence he gives, may and could be regarded as having some purpose of his own to serve. Rasheed Olaiya v. The State (2010) Vol. 180 LRCN 1-197 p.34; The State v. Dominic Okoro & Ors (1974) 2 SC 73 at 82; Ishola v. The State (1978) 9-10 SC 73 at 100 .
— N.S. Ngwuta, JSC. Odogwu v State (2013) – SC.122/2009
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Onubogu and Anor v. The State (1974) 9 S.C. 1, 20: the Supreme Court opined that where in a criminal case, one witness called by the prosecution’ contradicts another prosecution witness on a material point, the prosecution ought to lay some foundation, such as showing that a witness was hostile, before they can ask the court to reject the testimony of one witness in preference for the evidence of the discredited witness. It is not competent for the prosecution to discredit one and accredit the other.
A case is proved by either oral evidence or documentary/real evidence or a combination of all of this. It is not the quantum of evidence/witnesses, but the quality of the evidence/witnesses that matters. See Onwuka v. Ediala [1989] 1 NWLR (Pt.96) 182 at 187 and Lafarge Cement WAPCO Nigeria Plc v. Owolabi [2014] LPELR-24385(CA).
— B.B. Kanyip, J. Awogu v TFG Real Estate (2018) – NICN/LA/262/2013 para. 67.
A vital witness is a witness whose evidence may determine the case one way or the other and failure to call a vital witness is fatal to the prosecution s case. In other words, a witness who knows something significant about a matter is a vital witness. In Onah v. State (1985) 3 NWLR Pt. 12 Pg.236 a vital witness was described as a witness whose evidence may determine the case one way or the other and it is settled that the failure to call such a witness is fatal to the prosecution’s case.
– H.M. Ogunwumiju, JSC. State v. Ibrahim (2021) – SC.200/2016
No doubt, the prosecution is only obliged to call witnesses whose evidence is vital to the determination of the case for the prosecution and whose evidence would settle vital points of facts one way or the other to remove any element of doubt in respect of the guilt of the Defendant from the case of the prosecution.
– H.M. Ogunwumiju, JSC. State v. Ibrahim (2021) – SC.200/2016
As the Supreme Court per Tobi, JSC puts it in Nigerian Army v. Major Jacob Iyela [2008] LPELR-2014 (SC); [2008] 7-12 SC 35; [2008] 18 NWLR (Pt. 1118) 115: A case is not necessarily proved by the quantity of witnesses. A case is proved by the quality of the witnesses in the light of either inculpatory or exculpatory evidence, as the case may be. And so, it does not necessarily follow that because the respondent called four witnesses, they rebutted the evidence of the two witnesses of the appellant.
The trial Judge should take into consideration the demeanour of witnesses in the evaluation of evidence. Demeanour, which is outward or overt behaviour or manner of a witness, is the exclusive domain of the trial Judge. It includes all open habits and mannerisms of the witness. These ooze out from the body of the witness spontaneously and not tutored. Some of such body movements include a spontaneous positive or negative reaction to a question; shouting at a particular moment or the opposite action of a pretentious mum conduct; movement of part of the body, particularly the hands and the sudden change in the face arising either from anger or happiness, the latter resulting in either a smile or laughter. Another is a sudden remorse on the part of the witness, usually exhibited by refusal to look at the Judge or Counsel, or others in the court, but a sudden drop of the face in the witness box. There are quite a number of behaviours in the determination of demeanour which cannot be exhausted. I can stop with the above as the major conducts of witnesses. I should complete the picture by saying that as appellate judges are deprived of watching the demeanour of witnesses, trial Judges owe the administration of justice a big duty to arrive at the correct conclusion. Of course appellate Judges are not completely hopeless or helpless. They can watch the evaluation of demeanour by the Judge in the cold records.
— Niki Tobi, JSC. Buhari v. INEC (2008) – SC 51/2008
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