The Adoption Law of Lagos State (Cap.5) which came into force on 21st September, 1968 was the only applicable law on adoption in Lagos at the material time. It has not been shown that the said adoption of Emmanuel and Sarah was done under that law. If that had been so, the best evidence would have come from the Adopted Children Register established under section 16 of that law. The burden is on the respondent to produce that evidence. The law is that he who asserts the affirmative has the onus of proving it by virtue of section 135 of the Evidence Act.
– Uwaifo, JSC. Olaiya v. Olaiya (2002) – SC.190/1999