Another condition for the admissibility of electronic evidence under Section 84(4) of the Act is the production of an authentication/trustworthiness certificate of the computer used in producing the documents. From case law, this subsection permits even non-experts to issue such a certificate, especially persons who, though not possessing the required professional qualifications may have acquired some practical knowledge and being in the position described in the subsection to bring him within the definition of an expert by the expanded definition of an expert in Oando Nig. Plc V Adijere W/A Ltd (2013) 5 NWLR (Pt. 1377) 374. Whether an expert is competent in his field is a matter for the Court to decide, applying the credibility test after hearing his oral testimony.
— J.H. Sankey, JCA. Brila Energy Ltd. v. FRN (2018) – CA/L/658CA/2017