102) Besides, the Code gives power to the police to close a matter both before and after investigation. A police officer can foreclose an FIR before an investigation under Section 157 of the Code, if it appears to him that there is no sufficient ground to investigate the same. The Section itself states that a police officer can start investigation when he has a ‘reason to suspect the commission of an offence’. Therefore, the requirements of launching an investigation under Section 157 of the Code are higher than the requirement under Section 154 of the Code. The police officer can also, in a given case, investigate the matter and then file a final report under Section 173 of the Code seeking closure of the matter. Therefore, the police is not liable to launch an investigation in every FIR which is mandatorily registered on receiving information relating to commission of a cognizable offence.
Party
Lalita Kumari Versus Govt. of U.P. & Ors – WRIT PETITION (CRIMINAL) NO. 68 OF 2008 – NOVEMBER 12, 2013 (5 Judge Constitution Bench)
https://main.sci.gov.in/jonew/judis/40960.pdf
Lalita Kumari vs. Govt. of U.P