Parties and procedural roles: The Central Bureau of Investigation was the appellant/prosecuting agency. Dr R.R. Kishore, a public servant investigated without the former Section 6A approval, was the respondent relying on the law in force when investigation began. In Indian Supreme Court terminology, these parties are therefore described as petitioner/appellant and respondent, accused/prosecution, or contemnor/Court as appropriate—not automatically as plaintiff and defendant.

Detailed factual and procedural background: The CBI appealed in proceedings involving Dr R.R. Kishore, where investigation of a senior public servant had occurred without the approval formerly demanded by Section 6A of the Delhi Special Police Establishment Act. The issue was whether the 2014 judgment striking that protection applied only prospectively or rendered the provision void from inception.

How the dispute reached the Court: The proceeding numbered Crl.A. No. 377/2007 developed through the events recorded in the timeline: 2007: CBI prosecuted R.R. Kishore, a public servant, without prior Central Government approval under DSPE Act Section 6A. 2014: Subramanian Swamy decision struck Section 6A down. 11 September 2023: Constitution Bench held that invalidation operated from the provision’s 2003 commencement. The concrete problem was not merely academic; it required the Court to decide: When a statutory provision is declared unconstitutional, is the declaration ordinarily retrospective? Did the 2014 invalidation of Section 6A apply from 2003 to pending investigations?

The accused relied on the law as it stood when the investigation began and argued against retrospective disadvantage. CBI contended that an unconstitutional classification was void and could not validate a protective barrier. The Court examined Article 13 doctrine, overruling, finality and consequences for past transactions.

Expanded comparison of the competing positions: The side seeking relief asked the Court to apply Retrospective invalidity; prospective overruling; equality; finality of judgments to the actual institutional or individual harm shown by the record. The opposing side relied on statutory authority, procedural regularity, governmental necessity, finality or administrability, depending on the proceeding, and urged a narrower remedy. Both positions had to be tested against Delhi Special Police Establishment Act, 1946 Section 6A; Prevention of Corruption Act, 1988 and Articles 13, 14, 20 and 32.

What the Court had to evaluate: It examined the text and purpose of the governing provisions, binding precedent, the evidentiary or institutional record, and the practical consequences of accepting either interpretation. The decisive questions were: When a statutory provision is declared unconstitutional, is the declaration ordinarily retrospective? Did the 2014 invalidation of Section 6A apply from 2003 to pending investigations?

The Constitution Bench held that the declaration of unconstitutionality operated retrospectively: Section 6A was void from its insertion in 2003. Unless a court expressly invokes prospective overruling, an unconstitutional law is treated as invalid from inception, subject to finality of concluded proceedings.

Reasoning and legal effect: The result followed from the Court’s application of Retrospective invalidity; prospective overruling; equality; finality of judgments to Delhi Special Police Establishment Act, 1946 Section 6A; Prevention of Corruption Act, 1988 read with Articles 13, 14, 20 and 32. The Court distinguished the legal rule binding future courts from observations confined to the facts, and tailored the operative relief to the procedural posture of C.B.I. vs DR. R.R. KISHORE.

Practical consequence: The parties are bound by the operative directions in Crl.A. No. 377/2007; lower courts, governments, regulators or investigating authorities must apply the stated ratio in materially similar cases. Any prospective limitation, remand, monitoring direction, bail condition, implementation safeguard or preservation of concluded matters mentioned above forms part of the scope of the ruling. The signed judgment remains controlling if a short summary and the operative paragraphs differ.

Delhi Special Police Establishment Act, 1946 Section 6A; Prevention of Corruption Act, 1988

Articles 13, 14, 20 and 32

Retrospective invalidity; prospective overruling; equality; finality of judgments