Introduction
Investigative powers are an essential part of the criminal justice system. Police and other investigating agencies must have sufficient authority to discover facts, collect evidence, identify offenders, and ensure that violations of law are properly prosecuted. However, investigative power is not unlimited. When an investigation becomes vague, open-ended, or disconnected from the original allegations, it may transform from a legitimate search for truth into what is commonly described as a “fishing” or “roving” inquiry.
The rule of law requires a careful balance. While the State has a legitimate interest in investigating crime, individuals are equally entitled to protection against arbitrary intrusion, harassment, and investigations conducted without a defined legal purpose. The principle that investigation must have lawful boundaries is therefore closely connected with constitutional guarantees of fairness, personal liberty, privacy, and due process.
What Is a Fishing or Roving Inquiry?
A fishing inquiry generally refers to an investigation undertaken without a sufficiently specific factual or legal foundation, with the hope that some incriminating material may eventually be discovered.
A roving inquiry goes a step further: instead of remaining confined to the subject matter that legitimately triggered the investigation, the inquiry expands into unrelated transactions, individuals, documents, or allegations without adequate justification.
For example, where an investigation is initiated concerning a particular alleged offence, investigating authorities ordinarily must have a lawful basis for examining matters connected with that offence. The mere existence of investigative power should not automatically authorise an unrestricted examination of a person’s entire affairs.
The distinction is important because investigation is intended to discover evidence relating to an offence—not to create suspicion first and search for an offence later.
Investigation and the Rule of Law
The rule of law requires public authorities to exercise power according to law and within legally recognised limits. Investigating agencies are no exception.
An investigation may involve significant interference with individual rights. Searches, seizures, questioning, collection of financial information, examination of electronic devices, and access to private records can have serious consequences even before a person is formally accused or prosecuted.
Consequently, investigative authority must be exercised:
- for a legitimate statutory purpose;
- on the basis of relevant facts and circumstances;
- in accordance with prescribed legal procedures;
- proportionately to the nature of the allegations; and
- subject to judicial and constitutional safeguards.
This does not mean that an investigating agency must possess proof of guilt before commencing an investigation. Investigation necessarily involves the discovery of facts. However, the power to investigate cannot be equated with an unrestricted licence to investigate everything.
Constitutional Safeguards
The Indian constitutional framework provides important protections against arbitrary State action.
Article 14 guarantees equality before the law and protection against arbitrary State action. An investigation that is selective, unreasonable, or unsupported by a legitimate purpose may raise concerns under the constitutional principle of non-arbitrariness.
Article 21 protects life and personal liberty and requires State action affecting those interests to satisfy the standards of fairness established by constitutional law. Investigative processes that substantially interfere with liberty or privacy therefore cannot be viewed independently of Article 21.
The Supreme Court has also recognised privacy as a constitutionally protected right. In K.S. Puttaswamy (Retd.) v. Union of India, the Court recognised privacy as an intrinsic part of life and personal liberty under Article 21. This constitutional development has particular significance in an era where investigations increasingly involve personal communications, digital devices, financial information, and large volumes of private data.
Search for Evidence vs. Search for an Offence
One of the central concerns surrounding fishing inquiries is the difference between investigating an offence and searching for an offence.
An investigating agency may legitimately follow evidence wherever that evidence reasonably leads, even if the investigation develops in an unexpected direction. Criminal investigations cannot always be predicted in advance.
However, there must still be a rational connection between the investigative steps taken and a legitimate investigative purpose.
The concern arises when authorities effectively proceed on the basis that:
“We do not know whether an offence has occurred, but we will examine everything until we find something.”
Such an approach risks reversing the ordinary logic of criminal investigation and may expose individuals to unnecessary intrusion.
Investigative Discretion Is Not Absolute
Investigating authorities necessarily enjoy discretion. Courts generally recognise that judges should not routinely interfere with legitimate investigations merely because another investigative approach may appear preferable.
At the same time, judicial restraint does not mean judicial helplessness.
Courts retain the constitutional responsibility to intervene where investigative action is:
- manifestly arbitrary;
- undertaken for an improper purpose;
- without lawful authority;
- oppressive or abusive;
- unrelated to the subject matter of the proceedings; or
- conducted in a manner that seriously violates fundamental rights.
The principle is therefore one of controlled investigative discretion, rather than unrestricted investigative freedom.
The Role of Judicial Review
Judicial review serves as an important safeguard against abuse of investigative powers.
The High Courts, particularly under Article 226 of the Constitution, and the Supreme Court under Article 32, possess constitutional jurisdiction to protect fundamental rights and prevent misuse of legal processes.
At the same time, courts ordinarily exercise caution in interfering with investigations at an early stage. The existence of an investigation does not, by itself, establish illegality.
The appropriate question is whether the investigation has crossed the boundary between legitimate investigation and abuse of investigative power.
Courts may therefore examine the substance and circumstances of an investigation where there is credible material suggesting that the process itself is being misused.
Due Process and Investigative Fairness
A fair investigation is not merely beneficial to an accused person. It is fundamental to the administration of justice.
An investigation conducted within legal boundaries protects:
- The accused, from arbitrary prosecution and unnecessary intrusion.
- Victims, by ensuring that genuine allegations receive focused attention.
- Investigating agencies, by strengthening the credibility of their findings.
- Courts, by ensuring that evidence is collected through lawful processes.
- Society, by maintaining public confidence in the justice system.
An investigation that expands indiscriminately may ultimately weaken the prosecution itself. Evidence obtained through questionable methods can become vulnerable to legal challenge, while an investigation lacking a clear factual foundation may be perceived as harassment rather than law enforcement.
Digital Investigations and the Risk of Overreach
The problem has become increasingly significant in the digital age.
A single smartphone, computer, email account, or cloud account may contain years of personal information. A financial investigation may involve extensive transaction histories. Corporate investigations may generate thousands of documents.
Technology therefore creates a practical possibility of over-collection of information.
The fact that authorities can technically access large quantities of information does not necessarily mean that they should collect or examine information without limits. Modern investigations must increasingly consider principles of necessity, relevance, proportionality, data minimisation, confidentiality, and lawful access.
The greater the investigative capability of the State, the stronger the need for safeguards governing its exercise.
The Difference Between an Expanding Investigation and a Fishing Inquiry
Not every expansion of an investigation constitutes a fishing inquiry.
A legitimate investigation may reveal additional offences, additional participants, or previously unknown facts. Investigators must be able to follow credible leads that emerge during the investigation.
The critical distinction lies in evidentiary and legal connection.
Where new material reasonably connects an additional issue to the investigation, further inquiry may be justified. Conversely, where authorities move into unrelated areas without a demonstrable connection to the original allegations or without complying with applicable legal requirements, concerns regarding a roving inquiry become substantially stronger.
Thus, the test should not be whether the investigation has expanded, but why it has expanded and whether that expansion remains legally justified.
Protecting the Investigative Process Itself
Preventing fishing inquiries does not require weakening law enforcement. On the contrary, clearly defined investigative boundaries can improve the quality of criminal justice.
Investigating agencies can strengthen accountability by maintaining:
- clearly recorded reasons for significant investigative steps;
- proper authorisation for searches and seizures where legally required;
- documented links between evidence and the allegations under investigation;
- safeguards for privileged and confidential material;
- appropriate handling of personal and digital data; and
- periodic internal review of broad or prolonged investigations.
Such measures can ensure that legitimate investigative authority is exercised effectively while reducing the risk of arbitrary intrusion.
Conclusion
The fight against crime and the protection of individual liberty are not competing constitutional objectives. A democratic legal system must pursue both.
Investigating agencies require adequate powers to uncover the truth, but those powers must remain anchored in law, purpose, relevance, proportionality, and procedural fairness. The State cannot be expected to investigate serious offences effectively if its hands are tied; equally, citizens cannot be expected to have meaningful constitutional protection if investigative powers are treated as unlimited.
A fishing or roving inquiry becomes particularly problematic when the investigative process itself becomes the burden—when individuals are subjected to broad and prolonged scrutiny without a sufficiently defined legal foundation.
The enduring principle should therefore be simple: the power to investigate is a power conferred by law, not a power beyond law. Protecting that boundary