A CBI investigation is procedurally an investigation under the Bharatiya Nagarik Suraksha Sanhita 2023 — but with several layers of additional rigour. The institutional source is the Delhi Special Police Establishment Act 1946, which empowers the Central Government to extend the CBI's jurisdiction beyond Delhi with the consent of the State Government concerned. The substantive offences are typically under the Prevention of Corruption Act 1988, the BNS, the Companies Act, and various special statutes. The procedural framework is BNSS, modified by sanction requirements under Section 19 PC Act, the Section 17A approval regime, and the heightened evidentiary standards expected of central-agency investigations.
The defence framework therefore turns on three things: which substantive offences are invoked, whether the procedural prerequisites (sanction, approval, jurisdiction) are satisfied, and the operational stage of the case (preliminary enquiry, registered FIR, chargesheet, or trial). Strategy begins with mapping these three coordinates in the first conversation. The remainder of this page sets out each in turn, including the recent Supreme Court decisions defence counsel rely on, the principal forums at which CBI matters are tried in Delhi NCR, and the specific defence approach the firm applies at each stage.
The Core Statutory Provisions
The CBI Procedural Roadmap
A CBI matter typically follows a defined sequence. The defence intervention points map onto each stage. Where the matter has not yet reached registration of the FIR, the strategy is preventive — addressing the Preliminary Enquiry. After registration, the focus shifts to investigation and evidentiary discipline.
- Preliminary Enquiry (PE). Where the source information does not directly disclose a cognisable offence, the CBI registers a Preliminary Enquiry under its Manual. The PE is internal and not equivalent to an FIR. PE outcomes are either closure, conversion to a Regular Case (RC), or referral to a different agency.
- Section 17A approval. For matters involving public-servant decisions or recommendations, prior approval under Section 17A is obtained from the appropriate authority before any investigation begins.
- Registration of FIR / RC. The CBI registers a Regular Case on receipt of information disclosing a cognisable offence. The FIR is supplied to the accused on demand.
- Section 165 BNSS searches and seizures. Conducted with recorded reasons. Section 100 BNSS independent witnesses required.
- Section 179 BNSS examination of witnesses. Statements recorded; admissibility governed by BSA 2023 provisions.
- Section 41 BNSS arrest. Arrest where conditions in Section 41 are satisfied; Section 47 BNSS now codifies the Pankaj Bansal requirement of written grounds of arrest for general criminal procedure.
- Section 19 PC Act sanction. Before cognisance, sanction is obtained from the appropriate authority for prosecution of public servants.
- Filing of chargesheet under Section 193 BNSS. Filed before the CBI Special Court designated under the DSPE Act / PC Act.
- Trial. Conducted before the CBI Special Court. Standard trial procedure under BNSS Chapter 22 / 23.
- Bail and appellate cycle. Section 480 BNSS at Special Court → Section 483 BNSS at Delhi High Court → SLP to Supreme Court.
The Supreme Court Framework
Three Supreme Court decisions structure CBI defence in 2026.
State of Haryana v. Bhajan Lal
Yashwant Sinha v. Central Bureau of Investigation
Satender Kumar Antil v. Central Bureau of Investigation
Defence Strategy at Each Stage
The firm's CBI practice operates on a stage-aligned protocol.
Pre-FIR / Preliminary Enquiry. Where a Preliminary Enquiry has been intimated or is suspected from the documentary trail, the strategy is preventive: ensuring documentary preparation, engaging with the appropriate authority on Section 17A approval, and addressing any factual mischaracterisation before it crystallises into a Regular Case. Engagement at this stage materially shapes outcomes.
Post-FIR / pre-arrest. Once an FIR is registered, the focus shifts to anticipatory bail under Section 482 BNSS, parallel preparation of a quashing petition under Section 528 BNSS where the FIR discloses a Bhajan Lal defect, and engagement with the investigation through documentary cooperation while preserving the right against self-incrimination.
Search and seizure. Counsel attends or remains in close contact during searches. Procedural compliance under Sections 100 and 165 BNSS is monitored — recorded reasons, two independent witnesses, immediate preparation of seizure memos, and copies provided to the occupant.
Section 179 BNSS examination. Witnesses are prepared on the likely lines of questioning, the right to ensure recorded statements reflect what was said, and the limits of self-incrimination protection. Tendered written statements are prepared where appropriate.
Arrest and bail. Section 47 BNSS written-grounds compliance examined. Bail under Section 480 BNSS at Special Court; Section 483 BNSS at Delhi High Court where Special Court refuses. Quashing petitions filed in parallel where the underlying FIR has Bhajan Lal defects.
Trial defence. CBI Special Court trials are evidence-heavy. The strategy is methodical: cross-examination on documentary inconsistencies, preservation of Section 19 PC Act sanction objections, expert evidence challenges where digital evidence is involved, and final-arguments mapping to Bhajan Lal and Antil principles.
Engagement
Senior Partner Advocate Subodh Bajpai (LLM, MBA — XLRI Jamshedpur) leads the CBI practice. The team appears at the CBI Special Courts at Patiala House and Rouse Avenue, the Delhi High Court for Section 528 BNSS quashing petitions and Section 483 BNSS bail applications, and the Supreme Court of India for SLP. For active CBI raids, summons under Section 179 BNSS, anticipatory bail filings, or Section 17A approval challenges, contact +91 84008 60008 or legal@unifiedchambers.com.