The Supreme Court has reinforced a crucial principle: while the police must have the freedom to investigate without judicial interference, investigative powers cannot override constitutional safeguards. Effective policing and individual liberty must go hand in hand.
There is an enduring tension at the heart of criminal justice. A police investigator must be free enough to follow evidence wherever it leads, yet sufficiently disciplined to ensure that the power of investigation never becomes a licence to disregard constitutional liberty. Recent observations of the Supreme Court bring this delicate balance into sharp focus. On September 21, the Supreme Court reiterated that investigation of a crime falls within the domain of the police and that courts should ordinarily not interfere with an investigation or dictate when it should end.
The observation came while dealing with a case concerning an investigation under the Unlawful Activities (Prevention) Act. The Court found that the High Court had erred in refusing additional time to the investigating agency to complete the investigation. At first glance, this may appear to be a reaffirmation of investigative autonomy. But the same period has brought another important Supreme Court ruling that is equally significant for policing. In Jaskaran Jeet Singh Deol v. State of Punjab, the Court dealt with the consequences of an arrest in which the constitutional requirement of furnishing the grounds of arrest had not been complied with. The Court held that such safeguards are fundamental and laid down conditions governing any subsequent attempt to take the person into custody. Read together, these developments convey a powerful message: the Constitution protects both the effectiveness of investigation and the liberty of the individual. Neither can be sacrificed for the other. Investigation is fundamentally an evidence-gathering exercise.
It requires the investigating officer to reconstruct an event, identify the actors involved, establish motive where relevant, recover material evidence, examine witnesses, analyse digital and forensic evidence and ultimately present the facts before the competent court. If every investigative decision were routinely subjected to judicial micromanagement while the investigation was still underway, the distinction between investigation and adjudication would become blurred. But investigative autonomy is not investigative immunity. The police power to investigate derives from law. It is therefore inseparable from constitutional discipline.
The Supreme Court’s recent ruling on arrest is a reminder that procedural safeguards are not technical obstacles created to frustrate policing. They are constitutional mechanisms designed to ensure that coercive state power is exercised lawfully. The Court has specifically held that failure to furnish written grounds of arrest can render the arrest unconstitutional, and has directed that departmental consequences may follow where such failures occur. For the police organisation, this distinction is crucial. A strong investigation is not one in which the police merely secure an arrest quickly. It is one in which every consequential action can withstand legal scrutiny. Arrest should therefore emerge from investigation—not substitute for it. The modern investigator must increasingly work with forensic evidence, CCTV footage, call-detail records, financial trails, electronic devices, social-media material, geolocation data and other digital evidence.
This makes supervisory investigation more important than ever. The quality of a case is increasingly determined not by the number of arrests but by the quality, legality and evidentiary coherence of the investigation. There is another institutional lesson here. Supervisory officers cannot treat investigation as the exclusive responsibility of the investigating officer. A professional police organisation requires structured review at the level of the station, subdivision, district and, where necessary, specialised investigative units. Sensitive cases should have documented investigation plans, forensic strategies, witness-management plans and periodic supervisory reviews.
Technology can assist this process. Digital investigation-management systems can flag unexplained delays, missing forensic reports, pending examination of crucial witnesses, incomplete seizure documentation or unexplained gaps in the chain of custody. Such systems should not replace the investigating officer’s judgment; they should strengthen institutional oversight. The same principle applies to arrest. Every arrest should answer three basic questions: What is the legal basis? What is the evidentiary necessity? Have all constitutional safeguards been complied with? These questions should become part of police culture rather than merely part of courtroom defence.
The recent Supreme Court judgment is particularly instructive because it does not suggest that an accused who benefits from an unconstitutional arrest automatically acquires permanent immunity from investigation. The judgment recognises that a lawful investigation can continue, but any subsequent coercive action must comply with constitutional requirements and judicial oversight. This is not a weakening of policing. Properly understood, it is professionalisation of policing. India’s criminal justice system is moving into an era in which the distinction between investigation, intelligence and technology is becoming increasingly complex. Terror financing can leave digital trails across jurisdictions. Cybercrime may involve perpetrators, infrastructure and victims located in different countries. Organised crime increasingly combines extortion, drugs, financial fraud and digital communication.
In such an environment, investigators require greater autonomy, better technology and specialised expertise—not less. But greater capability must be accompanied by greater accountability. The ideal police investigator of the future will therefore be neither mechanically cautious nor casually coercive. He or she will be evidence-driven, technologically capable, legally literate and constitutionally conscious. The Supreme Court’s recent observations can consequently be read as two sides of the same principle: let the police investigate; let the Constitution discipline how they investigate. A mature criminal-justice system does not choose between effective policing and civil liberties. It builds institutions capable of delivering both. That is perhaps the real meaning of investigative autonomy in a constitutional democracy.
The recent Supreme Court judgment is particularly instructive because it does not suggest that an accused who benefits from an unconstitutional arrest automatically acquires permanent immunity from investigation. The judgment recognises that a lawful investigation can continue, but any subsequent coercive action must comply with constitutional requirements and judicial oversight
Dr Kumar Ashish, IPS, DIG, Koshi Range, Saharsa, Bihar and is known for pioneering people-centric policing initiatives; Views presented are personal.