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
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Accordingly, in arriving at a conviction in criminal cases, the court is concerned with whether or not there is sufficient credible evidence of probative value and not the number of witnesses called on an issue. See: Commissioner of Police v. Daniel Kwashie (1953) 14 WACA 319. Where a single witness called by the prosecution is neither an accomplice nor a tainted witness, a court of law is entitled to convict mainly on his credible evidence where his testimony did not by law require corroboration. Once the court is satisfied with the cogency, high quality and credibility of the evidence of a witness and accepts it, conviction based on such evidence should not be interfered with unless such evidence by law requires corroboration. So, in the Daniel Kwashie case, the learned magistrate convicted the appellant on the evidence of one witness. On appeal to the High Court, the learned Judge found that although, corroboration was not required by law, a court was generally reluctant to convict on the evidence of a single witness and proceeded to allow the appeal. On further appeal to the West African Court of Appeal, the appellate judge was reversed and his decision was set aside on the ground that there was sufficient evidence before the learned magistrate on which he based his conviction. It was further held that since the learned magistrate believed the witness and there was no imputation that the sole witness was an accomplice or a tainted witness, it was an error to reverse his decision and the conviction was restored.
— Iguh, JSC. Oguonzee v State (1998) – SC.131/97
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 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
The question whether or not a witness is an accomplice is one of law not of fact and if, as here, the learned trial Judge erred in regarding P.W.(18) as an accomplice (to the crime of conspiracy) it is certainly open to an appellate court (and in this instance, the Federal Court of Appeal) to reverse the erroneous view of the learned trial Judge.
— Idigbe, JSC. Ishola v State (1978) – SC.8/1977
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
However, and for whatever it is worth, the law is settled that a tainted witness is a person who is either an accomplice or who on the evidence may be regarded as having some purpose of his/her own to serve – see R vs Enahoro (1964) NMLR 65; Ifejirika vs The State (1999) 3 NWLR (pt. 593) 59; Ogunlana vs The State (1995) 5 NWLR (Pt. 395) 266.
— W.S.N. Onnoghen, JSC. Moses v State [2006] – S.C.308/2002
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