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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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
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
From the foregoing judicial decisions, it is clear that in election petition litigation, whether the witnesses which a party intends to call are ordinary or expert witnesses and whether they are willing or subpoenaed witnesses, their witness depositions must be filed along with petition before such witnesses will be competent to testify before the tribunal or court.
— H.S. Tsammani, JCA. Peter Obi & Anor. v INEC & Ors. (2023) – CA/PEPC/03/2023
The law is trite that unless where the law prescribes otherwise, there can be a conviction based on the evidence of a sole witness. Such evidence of a sole witness must be cogent, strong, credible and reliable before a Court can rely to found a conviction. See Oduneye v The State (2001) 2 NWLR (pt 697) 311, Abogede v State (1996) 5 NWLR (pt 449) 279 at 280, Ighalo v The State (2016) LPELR – 40840 (SC). 27 Ordinarily, the credibility of evidence does not depend on the number of witnesses who testify on a particular issue, but it depends on whether the evidence of a single witness is believable and accepted by the Court and if so believed by the Court, then it is sufficient to ground a conviction. SeeAli v The State (1988) 1 NWLR (pt 68) 1, Lase v The State (2017) LPELR – 42468 (SC), Abogede v The State (1996) 4 SCNJ 227.
— J.I. Okoro, JSC. Chibuike Ofordike V. The State (SC.695/2016, 2019)
Bello, JSC, in AJIDE v. KELANI (1985) 3 NWLR (pt.12) 248 at 200 – 261, (1985) 16 NSCC (pt.2) 1298 at 1309, stated the options thus – “He may cross-examine the witness on the writing and if he is satisfied with the answer given by the witness or if he does not intend to pursue the matter further, he is not required to show the writing to the witness or to prove the writing. But if the cross-examiner intends to contradict the witness by the writing, then he must show the writing to witness and call his attention to those part of the writing which are to be used for the purpose of contradicting the witness. It is only after this condition has been complied with that the writing can be admitted in evidence.”
The prosecution does not have the obligation to put forward two versions of one incident. See ONUBOGU v. THE STATE (supra); BOY MUKA v. THE STATE (supra); ALFRED ONYEMENA v. THE STATE (1974) ALL NLR 522. Once the prosecution can prove their allegation beyond reasonable doubt with the witnesses they have screened and selected, they would have discharged the burden of proof cast on them by law. They owe neither the Court nor the accused the duty to call a host of witnesses, or a particular witness.
— E. Eko, JSC. Galadima v. State (2017) – SC.70/2013
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