State of U.P. v. Bhagwant Kishore Joshi

Facts

• During investigation of a criminal case, the accused sought to quash the investigation arguing it was being conducted improperly and with mala fide intent.
• The Magistrate directed the police to alter the course of investigation.
• The State challenged this, arguing courts cannot interfere with investigation which is an executive function.

Issues

1. Whether courts can interfere with police investigation?
2. What are the exceptions to the principle of non-interference?

Held

• Investigation is predominantly a police function (executive in nature). Courts generally should not interfere with investigation.
• The principle of separation of powers underlies this rule: the judiciary should not assume executive functions.
• However, intervention is justified where:
• Investigation is mala fide (conducted to harass or for collateral purposes)
• Investigation violates mandatory statutory provisions (e.g., S.170-175 BNSS requirements)

Ratio Decidendi

Police investigation is a statutory function that must remain free from judicial superintendence to be effective. The check on police power lies in the subsequent judicial scrutiny of the investigation's product (charge sheet) rather than in contemporaneous interference.