Prosecution Cannot Hide Exculpatory Evidence: Adverse Inference Will Follow — SC in State of UP v. A.K. Gaba (2026)

Citation: 2026 INSC 568 | 2026 LiveLaw (SC) 644

Bench: Justice Pankaj Mithal and Justice Prasanna B. Varale

Introduction

When the CBI uses a tape recorder to capture a bribe demand, and then refuses to produce that very tape recorder in court, what should the court do?

The Supreme Court answered this on 27 May 2026 with clarity. In State of Uttar Pradesh v. A.K. Gaba, the Court held that when the prosecution deliberately withholds material evidence, especially electronic evidence that could have conclusively established or disproved the charge, the court must draw an adverse inference against the prosecution. The case rightly ended in acquittal.

This judgment restates and reinforces one of the foundational principles of criminal justice: the prosecution is not a party seeking victory. It is a minister of justice obligated to place all material before the court, including what may help the accused. Concealment is not a strategy. It is a failure of constitutional duty.

Background: The 1995 Bribery Allegation

The case has its roots in January 1995, more than three decades before the Supreme Court's ruling.

The accused:

• R.K. Srivastava — Superintendent
• A.K. Gaba — Inspector
• Alok Gupta — Inspector

All three were officials of a government agency in Uttar Pradesh.

The allegation:

In January 1995, R.K. Srivastava, along with A.K. Gaba and Alok Gupta, allegedly visited the factory of the complainant, Kuldeep Tiwari, and seized certain documents. Crucially, they did not provide any acknowledgment or receipt for the seized records, as legally required.

Following this seizure, R.K. Srivastava allegedly demanded a bribe of Rs. 80,000 from Kuldeep Tiwari for the return of the seized documents.

Kuldeep Tiwari reported the demand to the Central Bureau of Investigation (CBI). The CBI decided to lay a trap. A trap case under the Prevention of Corruption Act, 1988 is a carefully organised operation where:

• The bribe demand is first reported to anti-corruption authorities.
• The complainant is fitted with or given a tape recorder (or other recording device) to capture the bribe demand conversation.
• Marked currency is provided to be used as the bribe money.
• After the bribe is paid, CBI officers swoop in, recover the marked notes, confirm their presence through chemical tests, and arrest the accused.

The CBI trap resulted in the recovery of money from the residence of R.K. Srivastava. This led to the prosecution of all three accused under the Prevention of Corruption Act, 1988.

Trial Court: Conviction

The Special Judge, CBI Cases, convicted all three accused and sentenced them to imprisonment. The conviction rested primarily on:

• The testimony of the complainant (Kuldeep Tiwari) about the bribe demand.
• Recovery of the marked bribe money from R.K. Srivastava's residence.
• Chemical testing confirming the presence of phenolphthalein and sodium carbonate (used to mark currency) on the accused's hands and on the currency recovered.

The special judge apparently did not give adequate weight to the fact that a tape recorder, which had been part of the CBI trap operation, had never been produced in evidence.

Allahabad High Court: Acquittal

The convicted accused appealed to the Allahabad High Court. The High Court set aside all three convictions and acquitted all accused.

The High Court noted two critical weaknesses in the prosecution's case:

First, the complainant, Kuldeep Tiwari, and several independent witnesses had turned hostile during the trial. They contradicted their earlier CBI statements and did not support the prosecution's version of events in court.

Second, the High Court specifically highlighted that a tape recorder had been used by the CBI as part of the trap operation to record the bribe demand conversation. This tape recorder was never seized by the investigating agency. The recorded conversation was never produced in evidence.

The High Court found this suppression fatal to the prosecution's case. If the tape recorder contained a recording of the bribe demand, it was the best possible evidence to prove the charge. If the prosecution had this evidence and deliberately chose not to produce it, the only reasonable inference was that it did not support the prosecution's case.

The State of Uttar Pradesh appealed to the Supreme Court against the High Court's acquittal.

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What the Supreme Court Held

The Supreme Court dismissed the State's appeal and upheld the Allahabad High Court's acquittal in full. Justice Prasanna B. Varale, writing for the bench, delivered the judgment on 27 May 2026.

1. The Tape Recorder Was the Best Evidence for the Prosecution's Core Claim

The foundational requirement of a trap case under the Prevention of Corruption Act is to establish that:

1. There was an unlawful demand of money by the accused.

2. The money was paid pursuant to that demand as a bribe.

3. The accused accepted the money as a bribe.

Of these three elements, the demand is the most critical. Without proving a demand, even the recovery of marked currency from an accused is not sufficient to establish corruption. A person might innocently receive money without there having been a corrupt demand.

In this case, the CBI specifically used a tape recorder to capture the conversation between the complainant and the accused, precisely to record the demand. This was the most direct possible evidence of the demand. The Court held:

"The failure of the prosecution to produce the alleged tape-recorded conversation assumes greater significance because the same could have conclusively established the persons present at the time of the alleged demand and the exact nature of the conversation."

2. Withholding Material Electronic Evidence Invites Adverse Inference

The Court held that withholding material electronic evidence without justification invites adverse inference against the prosecution.

This principle connects to Section 114 of the Indian Evidence Act, 1872 (now Section 118 of the Bharatiya Sakshya Adhiniyam, BSA, 2023), which empowers a court to draw any presumption of fact that the court considers likely in the circumstances. Illustration (g) of Section 114 IEA (corresponding to Section 118 BSA) specifically provides that when evidence that could be and has not been produced is withheld, the court may presume that if produced, it would be unfavourable to the person who withholds it.

The Court stated: when the prosecution is in possession of material electronic evidence, such as a tape-recorded conversation of a bribe demand, and deliberately chooses not to produce it without any satisfactory explanation, the court must presume that the evidence would have been unfavourable to the prosecution.

The adverse inference here operates in the most powerful way. In a corruption case, if the tape recording of the alleged demand had supported the prosecution's case, there would be every reason to produce it. The only logical inference from its non-production is that it either did not contain a clear demand, contained an exculpatory conversation, or was otherwise not helpful to the prosecution.

3. The Prosecution Cannot Pick and Choose What Evidence to Produce

The Court emphasised a foundational principle of criminal justice: the prosecution is not a party seeking to win a case by producing only favorable evidence. It is an officer of justice whose duty is to place the full truth before the court.

The duty to produce all material evidence, including evidence that may assist the accused, is rooted in the constitutional principle of fair trial under Article 21 of the Constitution. The right to a fair trial is not just the right to be heard. It includes the right to have all material before the court — including material in the prosecution's possession that may help establish the accused's innocence.

When the prosecution selectively withholds evidence that might exculpate the accused, it does not merely weaken its own case. It actively violates the accused's right to a fair trial.

4. Mere Presence at the Scene Is Not Enough for Conspiracy Conviction

The Court also addressed the conviction of A.K. Gaba and Alok Gupta, the two inspectors who had accompanied Superintendent R.K. Srivastava on the original visit.

The headnote on this case confirms an additional important holding: mere presence of an officer when a superior accepted a bribe is not enough to infer criminal conspiracy under the Prevention of Corruption Act.

The Court held that for A.K. Gaba and Alok Gupta to be convicted of conspiracy to demand a bribe with R.K. Srivastava, there must be positive evidence that they agreed with and participated in the scheme to demand the bribe. The mere fact that they were present during the visit, or that they accompanied their superior, was not sufficient to establish that they were co-conspirators.

This holding is directly relevant to all conspiracy charges: conspiracy requires proof of an agreement, not just proximity to the act.

The Supreme Court underscored that justice cannot be based on fabricated or unverified legal authorities. Pooja Ramesh Singh v. J&K Bank (2026) is an important case on the responsible use of legal research. 

The Adverse Inference Doctrine: Principles for Exam Preparation

The adverse inference doctrine used in this case is governed by several provisions of Indian evidence law, now carried forward into the BSA framework.

Section 114 IEA / Section 118 BSA: Illustrations of Presumptions

Section 114 IEA (now Section 118 BSA) allows courts to presume the existence of any fact which it thinks likely to have happened, regard being had to the common course of natural events, human conduct, and public and private business.

Illustration (g) of the old Section 114 IEA, and the corresponding provision in Section 118 BSA, provides that when evidence which could be and has not been produced is withheld, the court may presume that if produced it would be unfavourable to the person withholding it.

Section 91 CrPC / Section 94 BNSS: Power to Compel Production

Under Section 91 CrPC (now Section 94 BNSS), a court or a police officer has the power to issue a summons or order for the production of any document or thing that is necessary or desirable for the purposes of investigation, inquiry, trial, or other proceeding.

Where the prosecution is in possession of material evidence and refuses to produce it, the accused or the court can invoke this provision to compel production.

The Best Evidence Rule

The best evidence rule requires that the best available evidence of a fact must be produced. Where a tape recording is the primary evidence of what was said during an alleged bribe demand, that recording must be produced. Secondary oral evidence about what was said cannot substitute for the recording without adequate explanation for the recording's non-production.

IEA to BSA Section Mapping

Why This Judgment Matters

It Reinforces the Prosecution's Constitutional Duty of Full Disclosure

The principle that the prosecution must disclose all material evidence, including exculpatory evidence, is not just a technical rule. It is rooted in the right to fair trial under Article 21. This judgment gives that constitutional principle concrete, practical teeth in the context of electronic evidence.

It Addresses Selective Evidence Production in Trap Cases

CBI and other anti-corruption agencies frequently use tape recordings, CCTV footage, and other electronic evidence in trap operations. This judgment makes clear that selective production, meaning producing the marked-currency recovery while concealing the audio recording, is not an acceptable strategy. The adverse inference will follow.

It Protects Persons from Wrongful Conviction

R.K. Srivastava, A.K. Gaba, and Alok Gupta had been convicted by the trial court in 2014, nearly twenty years after the alleged offence in 1995. The acquittal in 2026, following the High Court's reading of the evidence, illustrates how a case that appeared strong on some parameters (recovery of marked currency) can collapse when a critical piece of evidence (the tape recording of the demand) is withheld.

It Clarifies the Conspiracy Threshold in PC Act Cases

The additional holding on mere presence not being sufficient for conspiracy under the Prevention of Corruption Act gives all courts a clear principle for multi-accused corruption cases.

Conclusion

State of Uttar Pradesh v. A.K. Gaba is a judgment about honesty in the courtroom. The prosecution has an obligation to be the guardian of truth, not just the champion of conviction. When the CBI uses a tape recorder to capture evidence and then hides it from the court, that is not a prosecution strategy. That is a betrayal of the justice system.

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Frequently Asked Questions

Q1. What did the Supreme Court decide in State of UP v. A.K. Gaba (2026)?

The Supreme Court upheld the acquittal of three accused persons in a CBI trap case, holding that the prosecution's failure to produce a tape recorder used to record the alleged bribe demand was fatal to its case. The Court held that when material electronic evidence is withheld without justification, adverse inference must be drawn against the prosecution.

Q2. What is the adverse inference doctrine in evidence law?

The adverse inference doctrine, codified in Section 114 Illustration (g) of the Indian Evidence Act (now Section 118 of the BSA, 2023), provides that when evidence which could be and has not been produced is withheld, the court may presume that if produced it would be unfavourable to the person withholding it. In this case, the non-production of the tape recording was presumed to mean the recording did not support the prosecution's version of events.

Q3. What is the best evidence rule and how did it apply here?

 The best evidence rule requires that the most direct and reliable available evidence of a fact must be produced. In a trap case alleging a bribe demand, a tape recording of the actual demand conversation is the best evidence. When the prosecution had such a recording but chose not to produce it, oral testimony about the demand became a weaker substitute, and the suppression of the best evidence invited adverse inference.

Q4. What are the BSA and BNSS equivalents of the IEA and CrPC provisions in this case? Section 114 of the Indian Evidence Act (adverse inference and presumptions) is now Section 118 of the Bharatiya Sakshya Adhiniyam (BSA), 2023. Section 91 of the CrPC (power to issue summons for documents) is now Section 94 of the Bharatiya Nagarik Suraksha Sanhita (BNSS), 2023. Both came into force on 1 July 2024.

Q5. What did the Court say about conspiracy in this case?

The Court held that mere presence of an officer when a superior accepted a bribe is not enough to infer criminal conspiracy under the Prevention of Corruption Act, 1988. For a conspiracy conviction, there must be positive evidence of an agreement between the accused to commit the corrupt act. Accompaniment to the scene or being part of the official team does not establish the meeting of minds required for conspiracy.