Particularly in the cases where there is allegation that the Investigating Officer is biased against the accused and the investigation is not impartial, corroboration to the evidence of official witnesses by independent public witness(es) should be brought in so as to wash off the allegation of biased and partisan approach of the official witnesses. In the instant case though PW Bhupinder Singh was, statedly, joined with the raid party but for inexplicable reasons he has been kept away from the witness box in spite of the fact he was an important witness because he is shown to have attested Exhibit PW4/D, whereby the fake currency notes and the machine and its components, used for preparing the same were taken in police possession, Exhibit PW4/E, whereby a genuine hundred-rupee note was taken in possession, Exhibit PF, where-under persons of the appellants were searched, and Exhibit PG, whereby the appellants were arrested. Not only this, according to Exhibit PW4/D, seal after use was handed over to him and he alone could say whether or not the seal was, in fact, handed over to him and if yes, whether or not it remained with him till after receipt of report, Exhibit PW3/A, from Reserve Bank of India. This gains more importance, for, PWs SI Harwinder Singh and ASI Gurcharan Singh have maintained calculated silence as regards handing over of the seal to this witness and the date on which this seal came back to the Investigating Officer. Reluctance of the prosecution to bring PW Bhupinder Singh before the Court, in the situation, attracts illustration (g) appended to Section 114 of the Evidence Act, 1872 and leads to an inference that PW Bhupinder Singh, who could be but has not been produced as witness, if produced would have