1. Lalita Kumari v. Government of Uttar Pradesh [(2014) 2 SCC 1] Key Holding: o The Supreme Court held that registration of an FIR is mandatory under Section 154 CrPC if the information discloses a cognizable offense. o Section 156(3) can be invoked when the police fail to register an FIR despite receiving sufficient information about a cognizable offense. Relevance: It clarified that if a police officer fails to act under Section 154, the complainant may approach the magistrate under Section 156(3). 2. Sakiri Vasu v. State of Uttar Pradesh [(2008) 2 SCC 409] Key Holding: o The magistrate under Section 156(3) has the power to monitor investigations to ensure fairness. o Before approaching the magistrate, the complainant should exhaust the remedy of approaching higher police officers (e.g., SP under Section 154(3)). Relevance: This case emphasized that Section 156(3) is a discretionary power and not an automatic right. 3. Priyanka Srivastava v. State of Uttar Pradesh [(2015) 6 SCC 287] Key Holding: o The complainant must file an affidavit affirming the truthfulness of the allegations when approaching the magistrate under Section 156(3). o Section 156(3) should not be misused for frivolous complaints. Relevance: It established safeguards to prevent abuse of the provision. 4. Dilawar Singh v. State of Delhi [(2007) 12 SCC 641] Key Holding: o The Supreme Court held that the magistrate cannot directly interfere with the investigation conducted under Section 156(3), but they can monitor it. Relevance: This case emphasized the magistrate's role as a supervisory authority rather than as an investigative body. 5. Aleque Padamsee v. Union of India [(2007) 6 SCC 171] Key Holding: o The Supreme Court clarified that a magistrate cannot compel the police to file a charge sheet. The magistrate can only direct investigation and ensure that an FIR is registered. Relevance: This highlighted the limits of the magistrate's powers under Section 156(3). 6. Subhkaran Luhar v. State of Maharashtra [2004 Cri LJ 3392] Key Holding: o Section 156(3) empowers the magistrate to order investigation even if the complaint itself is sent to the magistrate instead of being directly registered as an FIR. Relevance: This case confirmed the flexibility of Section 156(3). Summary of Principles: 1. Mandatory Registration: Police must register an FIR if a cognizable offense is disclosed. 2. Exhaust Remedies: Before invoking Section 156(3), remedies like approaching higher police officials should be exhausted. 3. Affidavit Requirement: A complainant must support their application with an affidavit to prevent frivolous complaints. 4. Supervisory Role: Magistrates can supervise the investigation but cannot take over the police's investigative role.