Diary of Proceedings & Investigation Reports (Ss. 168–174)
- Section 168: When a subordinate police officer has made an investigation, he shall report the result to the officer in charge of the police station.
- Section 169: The officer in charge may release an accused on grounds of insufficient evidence or groundless charges (Both), during the stage of investigation — this power belongs to the investigating officer and officer in charge of the police station.
- Section 171: Witnesses and complainants (Both) are not required to accompany the police officer to the Magistrate's court.
- Diary of proceeding: May be used by the Investigating Officer to refresh his memory; the Court may use it for purposes of contradicting a police officer's statement.
- Contents of the diary: Visits to places, time when investigation started/complaint made, and statement of circumstances — all of these.
- Final report: Forwarded to the Magistrate through the Public Prosecutor.
- Section 173: The challan is forwarded to the Magistrate empowered to take cognizance; every investigation under Chapter XIV must be completed within fourteen days of the FIR under S. 154.
- Challan structure: Has 7 columns.
- Section 174: The officer in charge is duty-bound to submit a report regarding killing of a person by suicide, animal, or accident — all of these.
- Section 174-A: Both a medical officer and the incharge police officer have a legal obligation to immediately inform the Magistrate of a legally grievous injury caused at home to a person.