The purpose of evidence in chief is to lead evidence in support of a party’s pleadings. The purpose of cross examination is to discredit the witness of one’s opponent and make his testimony unworthy of belief. Cross-examination of a witness may also enhance the case of the party cross-examining by affirming of supporting his position. His Lordship Onnoghen, JSC (as he then was) provided an illuminating explanation on the treatment of evidence elicited under cross-examination in the case of: Akomolafe Vs Guardian Press Ltd. (2010) 3 NWLR (Pt.1181) 338 @ 351 F-H, as follows: “On the Issue as to whether both parties called evidence in support of their pleadings, as held by the lower Court, it is settled law that evidence elicited from a party or his witness(es) under cross examination, which goes to support the case of the party cross-examining, constitute evidence in support of the case or defence of that party. If at the end of the day the party cross-examining decides not to call any witness, he can rely on the evidence elicited from cross examination in establishing his case or defence. In such a case, you cannot say that the party calls no evidence in support of his case or defence. One may however say that the party called no witness in support of his case or defence, not evidence, as the evidence elicited from his opponent under cross examination which are in support of his case or defence constitute his evidence in the case. There is however a catch to this principle. The exception is that evidence so elicited under cross examination must be on facts pleaded by the party concerned for it to be relevant to the determination of the question/issue in controversy between the parties.
— K.M.O. Kekere-Ekun, JSC. MTN v. Corporate (2019) – SC.674/2014