“38. ...To say that a fair and just investigation would lead to the conclusion that the police retain the power, subject, of course, to the Magistrate's nod under Section 173(8) to further investigate an offence till charges are framed, but that the supervisory jurisdiction of the Magistrate suddenly ceases midway through the pre�trial proceedings, would amount to a travesty of justice, as certain cases may cry out for further investigation so that an innocent person is not wrongly arraigned as an accused or that a prima facie guilty person is not so left out. There is no warrant for such a narrow and restrictive view of the powers of the Magistrate, particularly when such powers are traceable to Section 156(3) read with Section 156(1), Section 2(h) and section 173(8) CrPC, 1973 as has been noticed hereinabove, and would be available at all stages of the progress of a criminal case before the trial actually commences. It would also be in the interest of justice that this power be exercised suo motu by the Magistrate himself, depending on the facts of each case. Whether further investigation should or should not be ordered is within the discretion of the learned Magistrate who will exercise such discretion on the facts of each case and in accordance with law." It was also clarified that, "The "investigation" spoken of in Section 156(3) would embrace the entire process, which begins with the collection of evidence and continues until charges are framed by the Court, at which stage the trial can be said to have begun."