A court has a duty to disallow a question which is not relevant to the proceedings; but a question which is relevant can freely be put to a witness and must be answered, although the weight to be attached to the answer is an entirely different matter. Thus relevance and admissibility are closely knit together while the question of weight appertains to the province of evaluation and should, as always, be kept in separate compartment.
– Achike JCA. Adeyemi v. Edigin (1990)
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It is trite law that there is no rule which imposes an obligation on the prosecution to call a host of witnesses; all the prosecution need do is to call enough material witnesses to prove its case, and in so doing it has a discretion in the matter. See: Samuel Adaje v. The State (1979) 6-9 SC 18 at 28. Bako Bahor v. Yaburi NA Police (1970) NMLR 107 at 112; E.O. Okonofua & Anor v. The State (1981) 6-7 SC 1 at 18. See also section 179(1) of the Evidence Act. What is more it is the law that if a witness is not called by the prosecution, the defence is at liberty to do so. —
Onu JSC. Oguonzee v State (1998) – SC.131/97
It is trite law that where there is conflict in the opinions of experts, it is the duty of the court to come to a conclusion in the case by resolving such a conflict and can do so by rejecting the opinion of one or the other such experts. See John Wilberforce Bamiro v. S.C.O.A. (1941) 7 WACA 150; R v. Godo (1975), 61 Cr App R.131; Ozigbo v. Police (1976) 1 NMLR 273, Laws and Practice Relating to Evidence in Nigeria by Aguda at p.115 Article 9-05.
— Edozie, JCA. British American v. Ekeoma & Anor. (1994) – CA/E/60/88
Secondly, it is a well established principle of law that it is not necessary for a person on whom the onus of proof lies, even in criminal cases, to call every available piece of evidence in order to discharge that burden. It is enough if evidence is tendered sufficient to discharge the onus which the law lays upon the prosecution. See: Francis Odili v. The State (1977) 4SC 1 or (1977) 11 NSCC 154 at 158 and Joshua Alonge v.I.G. of Police (1959) SCNLR 516; (1959) 4 FSC 203 or (1959) 1 NSCC 169. In the Francis Odili case, the appellant was convicted and sentenced to death. Following his arrest, the appellant was identified at an identification parade by one of the two Rev. Sisters they violently robbed with arms. At the trial, he pleaded alibi. The learned counsel contended inter alia that the evidence of identification was unreliable and that the prosecution failed to call two other eye witnesses to the incident. On appeal, this court per Alexander C.J.N. stated as follows:- “Counsel’s last submission was that the 2 night guards should have been called as witnesses as they were present throughout………………..The tribunal, in its judgment, pointed out that the defence had an equal opportunity to call the night guards if they considered that the evidence of the night, guards would be favourable to them. The tribunal found no merit in this submission and we unhesitatingly agree. The prosecution is not required to call very available piece of evidence to prove its case. It is enough if sufficient evidence is called to discharge the onus of proof beyond reasonable doubt.”
— Iguh, JSC. Oguonzee v State (1998) – SC.131/97
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
The fact that he (PW 4) is a brother to the deceased with but more, cannot in my view make or turn him into a tainted or biased witness. He was not shown to have been an accomplice in the commission of the offence nor that he had any interest or purpose of his own to serve as such witness. Relationship by blood without any more cannot tantamount to a disqualification from being a prosecution witness, and I am not aware of any of our laws which provide as such. Consequently, the evidence of PW 4 in my view requires no corroboration. Ishola v. The State (1978) 9 & 10 SC81; Onafowokan v. The State (1986) 2 NWLR (Pt. 23) 496; Arehia & Anor v. The State (1982) 4SC7 8; Hausa v. The State (1992) 1 NWLR (Pc 219) 600.
— Kutigi, JSC. Oguonzee v State (1998) – SC.131/97
The position is that a tainted witness is either an accomplice or a witness who has an interest to defend or a purpose to serve in a case in which he is called upon to give evidence as a witness. It has to be shown that the witness has some peculiar interest to protect or purpose to serve in the evidence he gives in a case in order to make him a tainted witness.
– M.L. Garba JCA. Odogwu v. Vivian (2009) – CA/PH/345/05
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