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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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
Okonofua & Anor v. The State (1981) 6-7 SC 1 at 18 where this court per Bello, J.S.C., as he then was, dealing with the same subject put the matter thus:- “The correct state of the law relating to the duty of the prosecution to call witnesses, whether their names appear on the back of the information or not, has been recently stated by this court in these terms: ‘The law imposes no obligation on the prosecution to call a host of witnesses. All the prosecution need do is to call enough material witnesses in order to prove its case; and in so doing, it has a discretion in the matter.’ ” See also Samuel Adaje v. The State (1979) 6-9 SC 18 at 28.
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 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
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
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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