I have already held that a document attached to or exhibited with affidavit forms part of the evidence adduced by the deponent and is deemed to be properly before the court and to be used, once the court is satisfied that it is credible. Being already an evidence before the court (on oath), the formality of certification for admissibility (if it required certification) had been dispensed with. Of course, the reason for this is easy to deduce, the first being that affidavit evidence is already an admitted evidence before the court, unlike pleading which must be converted to evidence at the trial at which time issues of admissibility of an exhibit is decided The second point is that an exhibited copy of a document attached to an affidavit evidence must necessarily be a photocopy or secondary copy (except where the document was executed in several parts or counter parts and the deponent has many of the parts to exhibit in original forms). It is therefore unthinkable to expect the exhibited photocopy to be certified by the adverse party before the court can attach probative value to it.
– I.G. Mbaba, JCA. Ilorin East v. Alasinrin (2012) – CA/IL/38/2011