Irregular Proceedings — Effect on Trials

Sections 506 to 512 of the Bharatiya Nagarik Suraksha Sanhita, 2023 (BNSS) — re-enacting Sections 460 to 466 of the Code of Criminal Procedure, 1973 (CrPC) — answer a single working question that decides hundreds of appeals every year: what happens when a Magistrate has done something wrong? Some wrongs do not touch the trial at all. Some destroy it root and branch. Some sit in between, surviving or falling by reference to whether they have caused a failure of justice. The chapter draws those three lines and provides the cure for each. It is the procedural conscience of the Code — the part that decides which mistakes a conviction can carry, and which it cannot.

The architecture comes from the Constitution Bench in Willie (William) Slaney v. State of M.P., (1955) 2 SCR 1140, which read the predecessor sections as a three-fold classification. Section 506 BNSS lists irregularities that do not vitiate proceedings at all, even without enquiry into prejudice. Section 507 BNSS lists irregularities that vitiate the proceeding irrespective of prejudice. Sections 508 to 511 BNSS list defects that vitiate only if a failure of justice has in fact been caused. Section 512 BNSS protects officers executing attachments against technical objections. Read together, the chapter tells the appellate or revisional court when to overturn — and when to leave a conviction alone.

The three-fold classification

The Supreme Court in Slacey/Slaney (above) and again in State of M.P. v. Bhuraji, (2001) 7 SCC 679, distilled the scheme. First, certain irregularities are listed as curable per se. No question of prejudice arises. Second, certain irregularities are listed as voiding the proceedings regardless of any good faith or absence of prejudice. Third, every other irregularity that the Code or its predecessor recognises is curable — but only if no failure of justice has resulted. The dividing line, said the Court in Bhuraji, is failure of justice. De novo trial is the last resort, used only when the error has truly destroyed the basis of conviction; it is never a default response to procedural slips. That principle now operates throughout the Code of Criminal Procedure and BNSS.

Section 506 BNSS — Irregularities that do not vitiate proceedings

Section 506 BNSS (previously Section 460 CrPC) protects a list of nine acts done by a Magistrate who, technically, is not empowered by law to do them. The list covers issuance of a search-warrant, an order to investigate a non-cognizable offence, an inquest order, process under Section 187 BNSS, taking cognizance under Section 210(1)(a) or (b) BNSS, transfer of a case under Section 212(2) BNSS, tender of pardon under Section 343 BNSS, the recall-and-try power under Section 450 BNSS, and the sale of property under Section 504 or Section 505 BNSS. Where a Magistrate not empowered nevertheless does any of these things 'erroneously in good faith', the proceedings are not set aside merely because of want of power.

Two conditions must converge. First, the irregularity must be only of empowerment — there must be no other ground that vitiates the proceeding (Tulsibala v. Ghoshal, (1951) 56 CWN 193). Second, the act must have been done erroneously and in good faith (Purshottam Jethanand v. State of Kutch, AIR 1954 SC 700). Where the Magistrate knew at the time of the order that he was not empowered, he was not acting 'erroneously'. Wilful disregard of the Code is not curable under Section 506 BNSS. The protection is also confined to a Magistrate; it does not extend to a Special Judge appointed under a special law (Bhajahari Mondal v. State of W.B., AIR 1959 SC 8). The grant of pardon, after commitment of the case to the Court of Session, is outside the section's scope (A. Devendran v. State of Tamil Nadu, (1997) 11 SCC 720).

Section 507 BNSS — Irregularities that vitiate proceedings

Section 507 BNSS (previously Section 461 CrPC, with the words 'or telegraph' dropped) lists the proceedings whose contravention is fatal. Where a Magistrate not empowered attaches and sells property under Section 84 BNSS, issues a search-warrant for postal documents, demands security to keep the peace or for good behaviour, discharges a person bound to be of good behaviour, cancels a bond to keep the peace, makes an order for maintenance, makes a Section 152 BNSS order on local nuisance, prohibits continuance of a public nuisance under Section 162 BNSS, makes an order under Part C or Part D of Chapter X, takes cognizance under Section 210(1)(c) BNSS, tries an offender, tries an offender summarily, passes a Section 360 BNSS sentence on proceedings recorded by another, decides an appeal, calls for proceedings under Section 438 BNSS, or revises an order under Section 491 BNSS — the proceedings are void, irrespective of any good faith or absence of prejudice.

The contrast with Section 506 BNSS is stark. Under Section 507, the question of prejudice never arises. Where a Magistrate not competent tries an offence exclusively triable by a Court of Session — for example, an offence under Section 103 BNS (previously Section 302 IPC) — the trial is void and incurable, even by consent (State v. Dias, AIR 1970 Goa 7). Where a conviction is recorded by a Magistrate on evidence taken by another, in a case not covered by the predecessor-successor power in Section 367 BNSS (previously Section 326 CrPC), the proceeding is void (Payare Lal v. State of Punjab, AIR 1962 SC 690). Many of the acts listed in Section 507 sit naturally alongside the procedural floors of security for keeping the peace and good behaviour, of maintenance of public order and tranquillity, and of maintenance orders for wife, children and parents. A Magistrate who lacks the empowerment to act under those chapters cannot acquire it by good faith.

Two clauses repay closer reading. Clause (k) — taking cognizance under Section 210(1)(c) BNSS (previously Section 190(1)(c) CrPC) by a Magistrate not so empowered — is incurable. Clause (l) — trying an offender — is the broadest and the most often litigated; if a Magistrate purports to try an offence not within his trial competence, the proceedings are void and the appellate or revisional court must set them aside without enquiring into prejudice. The companion clause (m), summary trial, intersects with the substantive limits in summary trial procedure: a summary trial held by a Magistrate not falling within the empowered category, or in respect of an offence outside the empowered list, is void.

Section 508 BNSS — Proceedings in the wrong place

Section 508 BNSS (previously Section 462 CrPC) protects a finding, sentence or order from being set aside merely because the inquiry, trial or other proceeding took place in a wrong sessions division, district, sub-division or local area, unless the error has in fact occasioned a failure of justice. Two propositions, settled in Rajkumari Vijh v. Dev Rajvijh, AIR 1977 SC 1101, mark out the section's reach.

1. Two kinds of jurisdiction. The competence to try a particular kind of offence goes to the root of the matter and renders the trial void; territorial competence does not. Section 508 BNSS cures only the latter.
2. The section applies only post-trial. If an objection as to want of territorial jurisdiction is raised at the initial stage, the trial court cannot continue with its eyes open to the absence of jurisdiction (Rajkumari Vijh, above). Section 508 only validates a trial that has already concluded without injustice.

The section dovetails with the general rule on territorial jurisdiction in the chapter on conditions requisite for initiation of proceedings. It does not confer jurisdiction where none exists; it only refuses to upset a completed trial in the absence of demonstrated prejudice (Nasiruddin Khan v. State of Bihar, AIR 1973 SC 186; Ram Chandra Prasand v. State of Bihar, AIR 1961 SC 1629). The plea of absence of territorial jurisdiction must be raised in the trial court — it is not available for the first time in appeal.

Section 509 BNSS — Non-compliance with Section 183 or Section 316

Section 509 BNSS (previously Section 463 CrPC) addresses the recording of confessions and statements. Where a confession or other statement of an accused, recorded or purporting to be recorded under Section 183 BNSS (previously Section 164 CrPC) or Section 316 BNSS (previously Section 281 CrPC), is tendered in evidence, and the recording Magistrate is found not to have complied with the prescribed procedure, the trial court may take evidence on such non-compliance. If satisfied that the non-compliance has not injured the accused in his defence on the merits and that the statement was duly made, it may admit the statement.

The classic distinction is between technical and substantive defects. The Supreme Court in State of U.P. v. Singhara Singh, AIR 1964 SC 358, and again in Kehar Singh v. State, AIR 1988 SC 1883, held that Section 463 cures technical defects only. Substantive requirements — such as the mandatory caution under Section 164(2) CrPC (now Section 183(2) BNSS) that the person is not bound to make a confession and that, if he does, it may be used in evidence against him — go to admissibility itself. Their breach is not curable. Failure to make the memorandum required by Section 164(4), or omission to obtain the accused's signature on the confessional statement, are technical defects that Section 509 BNSS can cure on proof of substantial compliance. Section 509 also lifts the bar of Section 91 of the Indian Evidence Act, 1872 (now its BSA counterpart), so that oral evidence may be led to show that the procedure was followed despite the apparent defect.

Section 510 BNSS — Effect of omission, absence or error in charge

Section 510 BNSS (previously Section 464 CrPC) is the operative provision when a charge is omitted, absent, or erroneous. Sub-section (1) protects a finding, sentence or order of a court of competent jurisdiction from invalidity on the ground that no charge was framed, or on any error, omission or irregularity in the charge — including any misjoinder of charges — unless, in the opinion of the appellate, confirmation or revisional court, a failure of justice has in fact been occasioned. Sub-section (2) gives the appellate court two remedies where failure of justice is found: order a charge to be framed and the trial recommenced from that point, or direct a new trial on a fresh charge. The proviso requires the appellate court to quash the conviction outright where, on the facts proved, no valid charge could be preferred. The section is the operative working partner of the chapter on charge — form, joinder and effect of errors.

The Supreme Court has repeatedly applied Section 464 CrPC in this spirit. In K. Brahmaiah v. Public Prosecutor, (1999) 2 SCC 522, the Court explained that non-framing of a charge does not vitiate a conviction when no prejudice is caused; the appellate response is reframing or retrial, not acquittal — except where the proviso applies. In Sanichar Sahni v. State of Bihar, (2009) 7 SCC 198, an accused charged only under Section 120B IPC (now its BNS counterpart) and convicted under that charge alone was held not to have suffered any prejudice; the trial was not vitiated. The fact-pattern test from Slaney remains the touchstone — whether the accused had a fair trial, knew what he was being tried for, had the main prosecution case fairly explained to him, and was given a full and fair chance to defend himself. Where evidence of a different offence emerges and the accused is convicted of it, the courts have allowed conviction under the alternative section so long as the fact-pattern does not surprise the defence: Ramdeo Rai Yadav v. State of Bihar, AIR 1990 SC 1180, upheld conviction under Section 302 IPC where the original charge was Section 396 IPC, since the homicidal act was within the same fact-matrix.

Section 511 BNSS — Failure of justice as the master test

Section 511 BNSS (previously Section 465 CrPC) is the chapter's catch-all. No finding, sentence or order passed by a court of competent jurisdiction is to be reversed or altered by a court of appeal, confirmation or revision on account of any error, omission or irregularity in the complaint, summons, warrant, proclamation, order, judgment or other proceedings before or during trial, or in any inquiry or other proceeding under the Code, or in any sanction for prosecution, unless the error has in fact occasioned a failure of justice. Sub-section (2) requires the court, in determining whether a failure of justice has resulted, to consider whether the objection could and should have been raised at an earlier stage.

Irregularity vs. illegality

The much-litigated distinction between an 'irregularity' (curable on proof of no prejudice) and an 'illegality' (incurable, going to the root of jurisdiction) is one of degree, not kind. The Privy Council in Pulukuri Kottaya v. Emperor, AIR 1947 PC 67, set the framework: where a trial is conducted substantially in the manner prescribed, any departure is an irregularity, curable on proof of no prejudice. Where it is conducted in a manner substantially different from the prescribed procedure, the defect is illegality, vitiating the trial regardless of proof of prejudice. The Supreme Court in Slaney (above) endorsed that test and has applied it consistently — most recently in Ashraf Khan v. State of Gujarat, AIR 2013 SC 217, which held that a TADA case registered without the District Superintendent of Police's approval under Section 20A of the Act was an incurable defect outside Section 465 CrPC. The defect went to the root.

Curable irregularities

The case law lists are long. Defects in investigation are curable on proof of no prejudice (H.N. Rishbud v. State of Delhi, AIR 1955 SC 196, and A.C. Sharma v. Delhi Administration, AIR 1973 SC 913). Sanction defects, where the sanctioning authority's mind is on record, are curable; total absence of sanction where one is required is not (Madanlal v. State of Punjab, AIR 1967 SC 1590). Non-compliance with the Section 313 CrPC examination of the accused (now its BNSS counterpart) is curable so long as no vital circumstance was withheld and prejudice is absent (Bibhuti Bhusan Das Gupta v. State of W.B., AIR 1969 SC 381). Defects in the dating or signing of the judgment are curable so long as the judgment was actually delivered. Misjoinder of charges is curable in the absence of failure of justice (Prem Chand v. State of Haryana, AIR 1989 SC 937). Defects in police investigation, including investigation by an officer of a rank below that prescribed by a special law, are curable unless prejudice is shown.

Incurable illegalities

By contrast, the courts have held the following to go to the root: refusal to give the accused a hearing; refusal to allow him to defend himself; refusal to explain the nature of the charge; trial of a warrant case as a summons case; trial of a summons case as a warrant case where the substantive procedural protections are different; absence of sanction where a sanction is mandatory under Section 197 CrPC or the Prevention of Corruption Act; complete denial of the opportunity to produce defence evidence under Section 243 or Section 247 CrPC (now their BNSS counterparts); judgment not delivered in open court as required by Section 353(1) CrPC; alteration of a judgment after signing on a matter other than a clerical or arithmetical error. Each of these cases sits on the principle that the irregularity has already occasioned, or implies, prejudice — the accused need not separately prove it.

Failure of justice — pleading and proof

The Supreme Court in State of Karnataka v. Kuppuswamy Gownder, (1987) 2 SCC 74, held that where the irregularity is one of the curable kind, the accused must plead and prove that a failure of justice has been occasioned. Without such pleading, the conviction by a competent court will not be quashed merely on a technical irregularity. The Court has reinforced the same point in Santosh De v. Archana Guha, (1994) 2 SCC 420 — every procedural infraction does not justify interference at the interlocutory stage; only those that have caused or threaten to cause prejudice. Sub-section (2) of Section 511 BNSS sharpens this discipline: where the accused had the opportunity to raise the objection at an earlier stage and did not, the appellate court is entitled to discount the plea of prejudice. The remedy of revision and the remedy of appeal both operate within these limits.

Section 512 BNSS — Defective attachment

Section 512 BNSS (previously Section 466 CrPC) is a narrow protective provision. No attachment made under the Code is to be treated as unlawful, and no person executing it is to be treated as a trespasser, by reason of any defect or want of form in the summons, conviction, writ of attachment, or other proceedings relating to it. The section protects executing officers from civil liability for technical defects in process — a corollary to the general rule in State of A.P. v. Cheemalapati Ganeswara Rao, AIR 1963 SC 1850, that a Magistrate's good-faith error does not expose the officer who carries out the order. The section operates alongside the recall-and-try power in the chapter on transfer of criminal cases, which itself appears in the Section 506 BNSS list of curable irregularities.

BNSS innovations — what changed

The BNSS does not rewrite this chapter; it ports it forward. The substantive scheme of Sections 460 to 466 CrPC has been retained word-for-word in Sections 506 to 512 BNSS, with three minor adjustments worth noting.

1. 'Or telegraph' dropped from Section 507 BNSS. Clause (b) of the predecessor section spoke of search-warrants for documents in the custody of a 'postal or telegraph authority'. The telegraph authority no longer exists in any operative sense; the BNSS reflects that.
2. Section 509 BNSS — internal cross-references updated. The section now refers to non-compliance with Section 183 or Section 316 BNSS, the BNSS analogues of Section 164 and Section 281 CrPC. The substantive test — technical defect curable, substantive defect incurable — is unchanged.
3. Section 506 BNSS — internal cross-references updated. The clauses that earlier cited Section 94, 155, 176, 187, 190, 192, 306, 410 and 458–459 CrPC now point to the equivalent BNSS provisions. The substance is identical.

The continuity matters. Decisions interpreting Sections 460 to 466 CrPC remain authoritative under the BNSS — Slaney, Bhuraji, K. Brahmaiah, Ashraf Khan, Singhara Singh, Kehar Singh, Pulukuri Kottaya, Rajkumari Vijh — every one of them continues to govern. The BNSS cleanup did not extend to this chapter because the framework was already settled and the case-law layer is thick.

Comparative table — CrPC ↔ BNSS

The renumbering is uniform: each CrPC section moves up by 46.

Subject	CrPC, 1973	BNSS, 2023	Change
Irregularities that do not vitiate	Section 460	Section 506	Cross-references updated; substance unchanged
Irregularities that vitiate	Section 461	Section 507	'Or telegraph' dropped from clause (b)
Proceedings in wrong place	Section 462	Section 508	No change
Non-compliance with Section 164/281 CrPC	Section 463	Section 509	Cross-references updated to Sections 183 and 316 BNSS
Effect of error in charge	Section 464	Section 510	No change
Failure of justice — catch-all	Section 465	Section 511	No change
Defective attachment	Section 466	Section 512	No change

Exam-pointer pitfalls

Five recurring distinctions drive the MCQ design in this chapter every year. They are worth pinning down.

1. Section 506 vs. Section 507 BNSS. The defining difference is good-faith mistake of empowerment vs. enumerated act done by a Magistrate not empowered. Where the act is in the Section 506 list and is done erroneously and in good faith, it is curable. Where it is in the Section 507 list, it is void irrespective of good faith and prejudice.
2. Section 511 vs. Section 507 BNSS. Section 511 covers procedural irregularities curable on proof of no failure of justice. Section 507 covers acts that are void per se. The first asks whether the trial was substantially in accord with the Code; the second skips that question and treats the proceeding as a nullity.
3. Substantive vs. technical under Section 509 BNSS. Mandatory caution to the confessor under Section 183(2) BNSS — substantive, incurable. Memorandum and signature requirements — technical, curable on oral evidence of substantial compliance. Singhara Singh and Kehar Singh are the locus classicus.
4. Section 510 BNSS proviso. Even where an error in the charge has occasioned failure of justice, the appellate court does not always order retrial — if no valid charge could be preferred on the facts proved, it must quash the conviction outright. The proviso is the chapter's only mandatory acquittal route.
5. Pleading prejudice — Section 511(2) BNSS. The accused must plead and prove failure of justice for a curable irregularity. Where the objection could have been raised earlier and was not, the appellate court is entitled to discount the plea. Kuppuswamy Gownder is the authority. The High Court's inherent jurisdiction under Section 528 BNSS is available where the procedural floor itself collapses.

The discipline is a calibrated one. The Code does not insist on perfection; it insists on substance. A trial that meets the substance of fair procedure survives the slips that did not affect it. A trial that did not meet that substance does not survive even if the formal record looks clean. Sections 506 to 512 BNSS are the pages on which appellate courts work that calibration year after year — and the pages on which judiciary candidates lose marks if they do not learn to draw the three lines.

Frequently asked questions

What is the difference between Section 506 BNSS and Section 507 BNSS?

Both deal with acts by a Magistrate not empowered to do them. Section 506 BNSS lists nine acts that are curable if the Magistrate acted erroneously and in good faith — the proceedings are not set aside on the ground of want of empowerment alone. Section 507 BNSS lists seventeen acts whose contravention voids the proceedings irrespective of good faith and irrespective of any question of prejudice. Trial of an offender by a Magistrate not competent falls under Section 507 BNSS — it is void per se, and even consent of the parties cannot cure it (Payare Lal v. State of Punjab, AIR 1962 SC 690).

When can the appellate court order a retrial under Section 510 BNSS?

Section 510(2) BNSS gives the appellate court two remedies on a finding of failure of justice. Where there has been an omission to frame a charge, it may order a charge to be framed and the trial recommenced from that point. Where there is an error, omission or irregularity in the charge, it may direct a new trial on a fresh charge. The proviso is critical — if the court finds that, on the facts proved, no valid charge could be preferred, it must quash the conviction outright. Retrial is not a default; failure of justice has to be specifically found, and the proviso must not apply (K. Brahmaiah v. Public Prosecutor, (1999) 2 SCC 522).

Is failure to give the Section 183(2) BNSS caution before recording a confession curable under Section 509 BNSS?

No. The caution that the person is not bound to make a confession and that, if he does, it may be used in evidence against him is a substantive requirement under Section 183(2) BNSS (previously Section 164(2) CrPC). Its breach is not curable. The Supreme Court in State of U.P. v. Singhara Singh, AIR 1964 SC 358, and Kehar Singh v. State, AIR 1988 SC 1883, held that Section 463 CrPC (now Section 509 BNSS) cures only technical defects in the recording — failure to make the memorandum, missing signature, defective form — not breaches that go to the very admissibility of the confession.

How is the line between an 'irregularity' and an 'illegality' drawn?

The Privy Council in Pulukuri Kottaya v. Emperor, AIR 1947 PC 67, and the Constitution Bench in Slaney v. State of M.P., (1955) 2 SCR 1140, drew the line by reference to substantial compliance. Where the trial is conducted substantially in the manner prescribed by the Code, any defect is an irregularity — curable under Section 511 BNSS on proof that no failure of justice was occasioned. Where the trial is conducted substantially differently from the prescribed procedure, or contravenes a provision intended to secure the proper administration of justice, the defect is an illegality — vitiating the trial without proof of actual prejudice.

Does a trial held in the wrong place under Section 508 BNSS automatically vitiate the conviction?

No. Section 508 BNSS protects a finding, sentence or order from being set aside merely because the proceeding took place in a wrong sessions division, district, sub-division or local area, unless the error has in fact occasioned a failure of justice. Rajkumari Vijh v. Dev Rajvijh, AIR 1977 SC 1101, made clear that this protection covers only territorial jurisdiction. Want of subject-matter jurisdiction — for example, a Magistrate trying an offence exclusively triable by the Court of Session — goes to the root of the matter and is not curable by Section 508 BNSS. The plea of absence of territorial jurisdiction must also be raised in the trial court, not for the first time in appeal.

Who must prove that a failure of justice has occurred under Section 511 BNSS?

The accused. The Supreme Court in State of Karnataka v. Kuppuswamy Gownder, (1987) 2 SCC 74, held that for an irregularity that is curable, the accused must plead and prove that a failure of justice has been occasioned. Without such pleading, the conviction by a competent court will not be quashed merely on technical procedural grounds. Section 511(2) BNSS adds a further filter — the appellate court is entitled to consider whether the objection could and should have been raised at an earlier stage. Late objections are weighed against the accused.