Preventive detention must stay within the authorised ground; a broader "law and order" basis invalidated the detention order.

Article 359 did not bar judicial review limited to whether detention was in fact under the Defence of India Act or Rules, whether the detaining authority was competent, or whether the order exceeded delegated power; the petition was therefore maintainable on that limited basis. A detention order framed on the wider ground of preventing acts prejudicial to "public safety and the maintenance of law and order" was not within Rule 30(1)(b), which authorised detention only for prejudicial conduct affecting "public order". Because preventive detention must stay strictly within the language of the empowering rule, an order disclosing a broader and unauthorised ground on its face was invalid, and the detenu was entitled to release.

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Issues: (i) whether the President's order under Article 359 barred the petition under Article 32 challenging detention under the Defence of India Act and the Defence of India Rules; (ii) whether a detention order stating that detention was necessary to prevent acts prejudicial to "public safety and the maintenance of law and order" was within Rule 30(1)(b), which referred to "public order".

Issue (i): whether the President's order under Article 359 barred the petition under Article 32 challenging detention under the Defence of India Act and the Defence of India Rules

Analysis: The bar under Article 359 and the Presidential order extended only to enforcement of the specified fundamental rights to the extent the deprivation was under the Defence of India Act or rules made thereunder. It did not oust judicial inquiry into whether the detenu was in fact detained under the Act or Rules, whether the detaining authority was competent, or whether the order was outside the scope of the delegated power. A petition alleging breach of the Act or Rules therefore remained maintainable for that limited purpose.

Conclusion: The preliminary objection failed; the petition was maintainable.

Issue (ii): whether a detention order stating that detention was necessary to prevent acts prejudicial to "public safety and the maintenance of law and order" was within Rule 30(1)(b), which referred to "public order"

Analysis: Rule 30(1)(b) authorised detention only to prevent conduct prejudicial to the specified heads, including public order. "Law and order" was held to be wider in scope and not synonymous with "public order". In preventive detention matters, the authority must act strictly within the terms of the rule as expressed in the order itself. The order on its face disclosed a ground outside the rule, and the inclusion of a valid ground could not cure the defect where the order also rested on an invalid and broader ground. The error was substantive, not merely clerical, and the Court could not substitute an assumed basis for the stated one.

Conclusion: The detention order was outside Rule 30(1)(b) and was invalid.

Final Conclusion: The detention could not be sustained under the Defence of India law, and the petitioner was entitled to release.

Ratio Decidendi: In preventive detention, the detaining authority must act strictly within the statutory language of the empowering provision, and an order disclosing on its face a ground wider than or different from the authorised ground is invalid even if another stated ground would have been permissible.

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