21. The scheme of Cr.P.C. and the prevailing circumstances require that the option to direct the registration of the case and its investigation by the police should be exercised where some investigation is required, which is of a nature that is not possible for the private complainant, and which can only be done by the police under whom statute has conferred the powers essential for investigation, for example (1) where the full details of the accused are not known to the complainant and the same can be determined only as a result of investigation, or (2) where recovery of abducted person or stolen property is required to be made by conducting raids or searches of suspected places or persons, or (3) where for the purpose of launching a successful prosecution of the accused evidence is required to be collected and preserved. To illustrate by example cases may be visualised where for production before Court at the trial (a) sample of blood soaked soil is to be taken and kept sealed for fixing the place of incident; or (b) recovery of case property is to be made and kept sealed; or (c) recovery under Section 27 of the Evidence Act; or (d) preparation of inquest report; or (e) witnesses are not known and have to be found out or discovered through the process of investigation.
