A piece of evidence contradicts another when it affirms the opposite of what that other evidence has stated not when there is just a minor discrepancy between them. Two pieces of evidence contradicts one another when they are themselves inconsistent. A discrepancy may occur when a piece of evidence stops short of, or contains a little more than what the other evidence says or contains some minor difference in details. See Gabriel v State (1989) 5 NWLR (Pt.122) p.460. If a witness makes a statement before trial which is inconsistent with the evidence he gives in Court and he does not explain the inconsistency to the satisfaction of the Court, the Court should regard his evidence as unreliable. See Onubogu & Anor v State (1974) (NSCC) p.358. I must say straightaway that it is only material contradictions that are to be considered.
– Rhodes-Vivour, JSC. Nwankwoala v FRN (2018) – SC.783/2015