It is also imperative to note that the fact that a witness opted to testify in his native language, is not a conclusive evidence that he is an illiterate. He may choose to do so because he feels much comfortable expressing himself in his mother-tongue, and not because he did not know how to write or read.
– T.N. Orji-Abadua, JCA. Kabau v. Rilwanu (2013) – CA/K/179/2001