Illustrate the rule of adverse inference.

No evidence is required of matters which are, either formally admitted for the purposes of the trial, in civil cases, by the pleadings, by answer to interrogatories, by agreement or otherwise and in criminal cases, as regards proof of those documents admitted under Section 294 of the Code of Criminal Procedure, 1973. It is incumbent upon a party in possession of best evidence on the issue involved, to produce such evidence and if such party fails to produce the same, an adverse inference is liable to be drawn against such party. The Court will be justified in drawing an adverse inference against that party. [Ms. Shefali Bhargava v. Indraprastha Apollo Hospital & Anr., 2003 NCJ 787 (NC)]. It is equally incumbent upon a party to produce evidence of some expert where the issue involved is a complex or difficult one as for instance, issues pertaining to engineering, medical, technology or science etc. Since the court cannot constitute itself into an expert body and contradict the claim/proposition on record unless there is something contrary on the record by way of expert opinion or there is any significantly acclaimed publication or treatise on which reliance could be based. [Dr. Harkanwaljit Singh Saini v. Gurbax Singh & Anr., 2003 NCJ 800 (NC)].