Ensuring Fairness in Criminal Investigations: The Judiciary’s Role

When a crime is reported, the wheels of the criminal justice system begin to turn – and the first to act is almost always the police. They gather evidence, question witnesses, arrest suspects, and build the foundation of every prosecution. But left entirely unchecked, this power can become an instrument of oppression. That’s exactly why India’s legal framework places a set of carefully designed judicial controls over the police function of investigation – controls that are limited in scope but enormously significant in practice. Understanding these controls is essential for anyone studying criminal justice, because they sit at the intersection of state power and individual liberty.

What counts as an “investigation” under Indian law 🔗

The term investigation has a precise legal meaning. Under the Code of Criminal Procedure, 1973 (CrPC), investigation covers all proceedings conducted by a police officer for the purpose of collecting evidence – from the moment an FIR is registered to the filing of a final report before the Magistrate under Section 173. This includes examining witnesses, conducting searches and seizures, making arrests, and recording statements. The police have wide operational autonomy during this phase, but that autonomy is bounded by both constitutional guarantees and statutory provisions designed to ensure the process is fair and lawful.

It is important to note from the outset that the judiciary does not direct the police how to investigate. Courts have repeatedly held that a Magistrate cannot interfere with the day-to-day conduct of an investigation or tell the police which leads to pursue. The judicial role is narrower but no less critical: it ensures that the investigation remains within the four corners of the law and does not trample upon the fundamental rights of individuals.

How investigation begins: cognizable vs. non-cognizable offences 🔗

The starting point of any investigation is the nature of the offence alleged. Indian law draws a clear line between cognizable and non-cognizable offences, and this distinction directly determines whether the police can act without judicial permission.

Cognizable offences and the mandatory FIR rule 🔗

For cognizable offences – generally the more serious ones, such as murder, robbery, and rape – Section 154 of the CrPC requires the officer-in-charge of a police station to register a First Information Report (FIR) when information disclosing such an offence is received. The word “shall” in the provision leaves no room for discretion. In Lalita Kumari v. Government of Uttar Pradesh (2014), a Constitutional Bench of the Supreme Court settled the law definitively: FIR registration is mandatory the moment information discloses a cognizable offence, and no preliminary inquiry to test its veracity is permissible at that stage. Once the FIR is registered, the police may proceed to investigate under Section 156 without requiring any prior Magistrate’s order. The Lalita Kumari judgment was a watershed moment because it closed the door on the widespread practice of police refusing to register FIRs, often at the cost of genuine victims.

Importantly, that same judgment also imposed an accountability measure: if a police officer has reason to believe that no cognizable offence is made out, they must record that reason in writing. This documentary obligation creates a paper trail that can be scrutinised later, acting as a soft form of judicial oversight even before a Magistrate formally enters the picture.

Non-cognizable offences and the Magistrate’s gate-keeping role 🔗

For non-cognizable offences, the position is entirely different. Section 155 of the CrPC bars the police from investigating such cases without the prior order of a Magistrate. The information is first recorded in a non-cognizable register, and only after the Magistrate grants permission can any investigation begin. This is a direct judicial check at the threshold: a judge must be satisfied that there is sufficient cause to set the machinery of investigation into motion against a person for a less serious offence.

The right against self-incrimination: a constitutional limit on investigative methods 🔗

Of all the controls on police investigation, the right against self-incrimination is arguably the most fundamental. It derives from Article 20(3) of the Constitution of India, which states that no person accused of an offence shall be compelled to be a witness against themselves. The Latin maxim that underlies this principle – nemo tenetur prodere accusare seipsum – means that a person cannot be forced to supply evidence for their own prosecution. This is not merely a procedural nicety; it is a structural safeguard against coercive interrogation and the extraction of forced confessions.

Section 161 and the right to silence during questioning 🔗

During investigation, Section 161 of the CrPC empowers a police officer to examine orally any person acquainted with the facts of the case. Such a person is bound to answer questions truthfully. However, Section 161(2) carves out a critical exception: a person is not bound to answer any question the answer to which would tend to expose them to a criminal charge or penalty. This provision mirrors Article 20(3) and effectively codifies the right to silence for self-incriminating questions within the investigation process. As the Supreme Court held in Nandini Satpathy v. P.L. Dani (1978), this protection extends not just to formal accused persons but also to witnesses who might potentially incriminate themselves – a significant judicial expansion of the right’s scope.

There is another important safeguard built into Section 162: any statement recorded by a police officer during investigation cannot be signed by the person making it. This rule directly prevents the fabrication or coercive use of such statements, since an unsigned statement has no evidentiary value as a confession. It can only be used to corroborate or contradict testimony given in court, not as substantive evidence of guilt.

Scientific tests and the limits of compulsion 🔗

The question of how far the right against self-incrimination extends to modern scientific techniques was definitively addressed in Selvi v. State of Karnataka (2010). The Supreme Court held that subjecting an accused to narco-analysis, brain mapping, or polygraph tests without their consent violates Article 20(3), because these techniques effectively compel a person to reveal self-incriminating information from their own mental processes. This ruling drew a clear constitutional line: the state may gather physical evidence from an accused (such as DNA samples or fingerprints), but it cannot use involuntary means to extract information from the accused’s own mind.

The Magistrate’s role during investigation: limited but critical 🔗

It is a common misconception that Magistrates are passive spectators during the investigation phase. In fact, the CrPC gives them a carefully delineated but highly significant supervisory function.

Receiving FIR copies and monitoring investigation progress 🔗

Under Section 157 of the CrPC, when a police officer proceeds to investigate a cognizable offence, they must send a report to the Magistrate empowered to take cognizance. This requirement means that Magistrates are legally bound to maintain oversight of every criminal investigation set in motion in their district. They are not at liberty to relax this supervision. The FIR copy, once received, is entered in prescribed registers and serves as the starting point of the Magistrate’s monitoring of the case.

The 24-hour rule and the power of remand 🔗

One of the most direct points of judicial intervention in investigation occurs when the police need to detain an arrested person beyond 24 hours. Section 57 of the CrPC mandates that an arrested person must be produced before the nearest Magistrate within 24 hours of arrest (excluding travel time). If the investigation is not complete within this window, the police must formally apply for remand under Section 167 of the CrPC. The Magistrate must then make an independent judicial determination: Is detention beyond 24 hours genuinely necessary? Is the accusation well-founded? Are there grounds to believe evidence will be secured through continued custody?

The Supreme Court has been emphatic that this is not a rubber-stamp exercise. In Arnesh Kumar v. State of Bihar (2014), the Court made clear that the Magistrate’s role at the remand stage is to function as the first constitutional safeguard of individual freedom, not to mechanically endorse what the police request. Magistrates must apply their mind to the material placed before them. A remand order is a judicial order, and it must meet the standards of a judicial decision.

Recording confessions under Section 164 🔗

The CrPC expressly prohibits police officers from recording confessions – precisely because confessions made to the police are treated as inherently suspect on account of the coercive environment of custody. Instead, Section 164 of the CrPC provides that confessions and statements during the investigation phase must be recorded by a Magistrate. Before recording a confession, the Magistrate must warn the person that they are not obliged to confess and that anything they say may be used against them. The Magistrate must also be satisfied that the confession is being made freely and voluntarily. This judicial role acts as a crucial filter against confessions that are the product of coercion or inducement.

D.K. Basu guidelines: judicially mandated procedural safeguards 🔗

No discussion of judicial control over investigation is complete without reference to D.K. Basu v. State of West Bengal (1997). Faced with a rising tide of custodial deaths and violence, the Supreme Court issued a comprehensive set of binding guidelines that every police officer conducting an arrest or interrogation must follow. These include: wearing visible identification tags, preparing a detailed arrest memo attested by a witness, informing a family member or friend about the arrest, allowing the arrested person to consult a lawyer during interrogation, and sending copies of all arrest-related documents to the Illaqa Magistrate. Critically, the Court directed that a police control room must be established at all district and state headquarters to track the location of all arrested persons – a transparency measure aimed at preventing secret detention.

These guidelines were subsequently incorporated into the CrPC through the 2008 amendment. Their significance lies not just in their content but in their source: they are a direct judicial imposition on executive police action, made in exercise of the Supreme Court’s jurisdiction under Article 32 of the Constitution. Failure to follow them can attract contempt of court. This represents one of the most assertive instances of judicial oversight over the investigation function in Indian legal history.

Where the judiciary does not intervene 🔗

Understanding the limits of judicial control is as important as understanding its content. Courts have consistently held that they cannot direct the police on the manner of conducting an investigation, the specific witnesses to examine, or the strategy to adopt in gathering evidence. The Magistrate’s power under Section 156(3) to direct investigation is meant to ensure that a cognizable offence is investigated at all – not to micromanage the process. The investigative function is, by design, executive in nature, and separation of powers demands that the judiciary not convert itself into an investigative authority. The judiciary intervenes when rights are threatened or procedures are violated; it steps back when operational investigative choices are at stake.

The new legislative framework: BNSS 2023 🔗

With the enactment of the Bharatiya Nagarik Suraksha Sanhita (BNSS), 2023, which has replaced the CrPC, the core structure of judicial control over investigation remains intact. The equivalent provisions – mandatory FIR registration for cognizable offences, the 24-hour production requirement, the Magistrate’s remand power, and the prohibition on police recording confessions – have all been carried forward. Section 181 of the BNSS mirrors the old Section 161 and 162 of CrPC, continuing to prohibit signatories on police-recorded statements and protecting the right against self-incrimination. The new framework also explicitly requires audio-visual recording of statements in certain circumstances, which is a forward step in creating a more transparent and accountable investigation process.

What do you think? Given that the judiciary’s role during police investigation is intentionally limited – intervening only to check rights violations rather than directing how investigations are conducted – do you think this balance adequately protects accused persons, or does it give the police too much unchecked latitude in practice? And considering how custodial violence persists despite landmark rulings like D.K. Basu, what more can the judiciary realistically do to enforce constitutional safeguards at the investigation stage?

References

1. https://devgan.in/crpc/chapter_12.php
2. https://www.drishtijudiciary.com/code-of-criminal-procedure/lalita-Kumari-v-state-of-up-&-ors-2014
3. https://drishtijudiciary.com/editorial/right-against-self-incrimination
4. https://www.jyotijudiciary.com/investigation-under-the-code-of-criminal-procedure-crpc-a-comprehensive-guide/
5. https://highcourtchd.gov.in/sub_pages/left_menu/Rules_orders/high_court_rules/vol-III-pdf/chap11partA.pdf
6. https://www.legalserviceindia.com/legal/article-573-remand-by-a-judicial-magistrate-if-investigation-is-not-completed-within-24-hrs.html
7. https://cdnbbsr.s3waas.gov.in/s3ec030b6ace9e8971cf36f1782aa982a7/uploads/2025/09/2025090896.pdf
8. https://ksandk.com/litigation/requirements-of-arrest-dk-basu-guidelines/
9. https://crlreview.wordpress.com/2020/07/27/revisiting-the-d-k-basu-guidelines-is-it-necessary/
10. https://www.ijcrt.org/papers/IJCRT25A6059.pdf