In a criminal prosecution, there is an obligation cast on the investigator not only to be fair, judicious and just during investigation, but also that the investigation on the very face of it must appear to be so, eschewing any conduct or impression which may give rise to a real and genuine apprehension in the mind of an accused and not mere fanciful, that the investigation was not fair. In the circumstances, if an informant police official in a criminal prosecution, especially when carrying a reverse burden of proof, makes the allegations, is himself asked to investigate, serious doubts will naturally arise with regard to his fairness and impartiality. It is not necessary that bias must actually be proved. It would be illogical to presume and contrary to normal human conduct, that he would himself at the end of the investigation submit a closure report to conclude false implication with all its attendant consequences for the complainant himself. The result of the investigation would therefore be a foregone conclusion. Mohan Lal v. State of Punjab, (2018) 17 SCC 627.