Burden of proof is two-fold. The first is the abitity of a plaintiff to establish and prove the entire or reasonable portion of his case before a court of law that can give judgment in his favour. This is always constantly on the plaintiff. The other type is related to particular facts or issues which a party claims exist. It is this burden of proof that oscillates from one party to the other. While the first type of burden of proof is called legal burden or the burden of establishing a case, the second one is called evidential burden Federal Mortgage Finance Ltd v. Ekpo (2004) 2 NWLR (Pt.856) 100 at 122, (2005) All FWLR (Pt. 248) 1667; Ogule Ankpa Agatu Co-operative Group Farming Society v. Nigeria Agricultural and Co-operative Bank (1999) 2 NWLR (Pt.590) 234 … While the legal burden of proof is always stable or static, the burden of proof in the second sense i.e. evidential burden of proof may oscillate constantly accordingly, as one scale of evidence or the other preponderates.
— M. Peter-Odili JSC. Nnaemeka Okoye & Ors. v. Ogugua Nwankwo (SC. 234/2004, 27 Jun 2014)