Search by police officer :

This Section authorises general search if the police officer has reason to believe that anything necessary for the purpose of an investigations may be found. The officer acting under this sub-section must record in writing his reasons for making of a search. But, the illegality of search will not affect the validity of the articles or in any way vitiate the recovery of the articles and the subsequent trial. (Section 165)

Whenever any person is arrested or detained in custody and it appears that the investigation cannot be completed within the period of twenty four hours as laid down in Section 57 and that there are grounds for believing that the accusation or information is well founded, the officer in charge of the police station or other competent investigation officer shall promptly transmit to the nearest judicial Magistrate a copy of the entries in the diary relating to the case, and shall forward the accused to such Magistrate at the same time (required to be mentioned day by day under Section 172). The Magistrate may then authorise the detention of the accused in custody for a term not exceeding of fifteen days. (Section 167) Every investigation must be completed without undue delay. On completion of investigation, the competent police officer under the Code shall forward a police report with the prescribed details to a Magistrate empowered to take cognizance of the offence and send along with the report all documents or relevant extracts on which the prosecution intends to rely. (Section 173)