Introduction
A key witness has just finished testifying, and their account seemed compelling. But the opposing lawyer isn't done — they call a second witness who says the first one has a reputation for dishonesty, produce evidence the first witness was paid to testify, or point to a statement the same witness gave earlier that flatly contradicts what they just said in court. Is any of this actually allowed?
Yes — and Section 158 of the Bharatiya Sakshya Adhiniyam, 2023 (BSA) is the provision that spells out exactly how. Sitting in Chapter X ("Of the Examination of Witnesses"), it lists the specific, limited methods by which a witness's credibility can be attacked, and draws a careful line around what happens when a witness is asked to explain themselves. This article walks through all three methods, the rule protecting a witness's answers about their own credibility opinions, and why this provision underpins so much of what happens in cross-examination.
158. Impeaching credit of witness.
The credit of a witness may be impeached in the following ways by the adverse party, or, with the consent of the Court, by the party who calls him:
(a) by the evidence of persons who testify that they, from their knowledge of the witness, believe him to be unworthy of credit;
(b) by proof that the witness has been bribed, or has accepted the offer of a bribe, or has received any other corrupt inducement to give his evidence;
(c) by proof of former statements inconsistent with any part of his evidence which is liable to be contradicted.
Explanation.—A witness declaring another witness to be unworthy of credit may not, upon his examination-in-chief, give reasons for his belief, but he may be asked his reasons in cross-examination, and the answers which he gives cannot be contradicted, though, if they are false, he may afterwards be charged with giving false evidence.
Section 158 Explained: Three Distinct Routes to Impeachment
Section 158 does not leave credibility attacks to improvisation — it fixes three specific methods, and only these three are available under this provision. Each targets a different weakness in a witness's reliability, and each requires a different kind of proof.
These three routes operate on different logic. Clause (a) attacks general character for truthfulness through outside opinion. Clause (b) attacks motive — a witness who has been paid or promised something has a direct, personal reason to shade their testimony. Clause (c) attacks consistency itself, on the theory that a witness who tells the story differently at different times has, at minimum, one version that is wrong.
The Explanation: Opinions Can Be Tested, But Not Contradicted
The Explanation appended to Section 158 handles a specific procedural wrinkle: when one witness testifies under clause (a) that another is unworthy of credit, how far can that opinion be probed? The rule splits the question in two. During examination-in-chief — when the impeaching witness is first questioned by the party who called them — they cannot volunteer their reasons for the belief; only the conclusion ("I believe him unworthy of credit") is elicited at that stage. But in cross-examination, the opposing party can ask the impeaching witness to explain those reasons.
Once given, however, those reasons cannot themselves be contradicted by further evidence — the inquiry stops there, to avoid spiralling into an endless chain of collateral disputes about why one witness thinks poorly of another. The only check on dishonesty at that point is that a witness who answers falsely can subsequently be prosecuted for giving false evidence.
Worked Example: Testing a Dying Declaration Witness
Consider a murder trial where a witness testifies to a dying declaration naming the accused. Defence counsel, having independently learned that this same witness gave an earlier statement to a different person describing the declaration differently, invokes clause (c) — proving the prior inconsistent statement to impeach the witness's current account.
This is exactly the kind of scenario Section 161 of the BSA — already covered in this series — is designed to enable when the declarant themselves is unavailable: it lets a party impeach the credit of an absent declarant "as if" they had been called and cross-examined. Section 158 supplies the actual toolkit; Section 161 is what makes that toolkit available even when the person whose credit is in question can never take the stand.
Who Can Impeach — And an Important Twist
Ordinarily, it is the adverse party who impeaches a witness's credit; that is the entire logic of cross-examination. But Section 158 also allows the party who called the witness to do so, with the Court's consent — an option that matters most when a party's own witness turns hostile, giving testimony damaging to the case of the very side that called them.
This dovetails directly with Section 157 of the BSA, which lets a court permit the calling party to put cross-examination-style questions to their own witness. Together, Sections 157 and 158 give a party facing an unexpectedly hostile witness a real, structured way to respond — not just to question them more searchingly, but to attack their credit outright, using the same three methods available to the opposing side.
Section 158 BSA vs. Section 155 IEA: An Unbroken Framework
Section 158 corresponds to Section 155 of the Indian Evidence Act, 1872 (IEA), and every element — the three clauses, the Explanation, and the calling-party exception — carries forward without substantive change.
| Element | IEA, 1872 (Section 155) | BSA, 2023 (Section 158) |
|---|---|---|
| Three impeachment methods | Reputation opinion, corrupt inducement, prior inconsistent statement | Unchanged |
| Calling party's own witness | Permitted with Court's consent | Unchanged |
| Explanation on credibility-opinion answers | Present, answers not contradictable | Unchanged |
This continuity means the substantial Indian case law on what counts as a genuine prior inconsistency, and on the standard of proof for corrupt inducement, transfers directly to Section 158 practice under the BSA.
Who Section 158 Actually Affects
- Cross-examining counsel rely on this provision as the statutory basis for nearly every credibility attack they mount on an opposing witness.
- Parties whose own witness turns hostile gain a real remedy: with the Court's consent, they may impeach their own witness's credit using the same three methods.
- Witnesses being cross-examined about a colleague's credibility opinion must be prepared to explain their reasoning, knowing those answers cannot later be contradicted but can expose them to a perjury charge if false.
- Trial judges must police the boundary between genuine impeachment under the three fixed methods and improper, unfounded attacks on a witness's character.
- Litigants relying on hearsay statements admitted under Sections 26 or 27 use Section 158's methods, via Section 161, to test the credit of a declarant who is not present to defend it.
Key Takeaways
- Only three methods are recognised: reputation opinion, corrupt inducement, and prior inconsistent statements — Section 158 does not leave impeachment open-ended.
- Reasons for a credibility opinion can be probed but not rebutted: cross-examination can draw them out, but the answers stand unless shown to be false through a separate perjury charge.
- The calling party has a real remedy for a hostile witness: with Court consent, they too can impeach their own witness's credit.
- It powers Section 161's fiction for absent declarants: the same three methods are what a party uses to impeach the credit of someone who made a statement under Sections 26 or 27 but can never be cross-examined directly.
- The rule is unchanged from 1872: Section 158 BSA carries forward Section 155 IEA in full.
Conclusion
Section 158 is the backbone of credibility-based cross-examination in Indian trial practice. By fixing exactly three routes to impeachment — and carefully calibrating how far a witness can be pressed to explain a credibility opinion — it gives litigants real tools to test a witness's reliability without turning every trial into an unbounded inquiry into every witness's entire life and character.
For counsel on either side, the discipline the section demands is the same: know which of the three methods actually fits the weakness you've identified, and be ready to prove it properly, because Section 158 does not reward vague insinuation — only genuine, provable grounds for doubting a witness's word.