The apex court clarified a pivotal point of Administrative Law concerning the validity of a CLU issued without the required statutory backing. The judgment emphasized that once a statute prescribes a particular mode of action, any deviation makes the act unlawful from the date of its issuance, and subsequent approval cannot retrospectively validate it. Key Developments The Court ruled that Retrospective Validation cannot cure a jurisdictional defect when the original act lacked statutory authority. It held that Ex Post Facto approval by a Board does not transform an unlawful CLU into a lawful one. The judgment reiterated the principle that compliance with the procedural requirements laid down in the statute is mandatory; any act performed otherwise is void ab initio. Important Facts The case arose when a Board, after the issuance of a CLU, attempted to regularise it through a subsequent approval, arguing that the later endorsement should validate the earlier defect. The Court examined the statutory framework governing CLUs, which explicitly mandates that the issuing authority must possess statutory power at the time of grant. Since the authority lacked such power, the CLU was deemed void, and the later Board approval could not revive it. UPSC Relevance This judgment is directly relevant to GS Paper II (Polity) and GS Paper IV (Ethics) for the following reasons: It illustrates the doctrine of Jurisdictional Defect , a core concept in administrative law. The ruling underscores the constitutional prohibition against Ex Post Facto actions, reinforcing the rule of law. Understanding the limits of Retrospective Validation helps aspirants analyse governance challenges where agencies seek to regularise procedural lapses. The case highlights the importance of statutory compliance for administrative agencies, a frequent theme in questions on good governance and accountability. Way Forward For policymakers and administrators, the judgment signals the need to: Ensure that all delegations of power are backed by clear statutory provisions before any quasi‑legislative instrument is issued. Institute robust internal audit mechanisms to detect and correct procedural lapses at the earliest stage, avoiding reliance on post‑facto regularisation. Strengthen legislative drafting to minimise ambiguities that could invite retrospective validation attempts. Educate officials on the constitutional limits of ex post facto actions, reinforcing the principle that the rule of law cannot be compromised for expediency. In sum, the decision reaffirms that procedural fidelity to statutory mandates is non‑negotiable, and any attempt to cure a defect after the fact will not withstand judicial scrutiny.