In this landmark judgment (for Obiter Dicta), Apex Court has held that,
A parliamentary legislation when it receives the assent of the President of India and is published in the Official Gazette, unless specifically excluded, will apply to the entire territory of India. If passing of a legislation gives rise to a cause of action, a writ petition questioning the constitutionality thereof can be filed in any High Court of the country. It is not so done because a cause of action will arise only when the provisions of the Act or some of them which were implemented shall give rise to civil or evil consequences to the petitioner. A writ court, it is well settled, would not determine a constitutional question in a vacuum.
The court must have the requisite territorial jurisdiction. An order passed on writ petition questioning the constitutionality of a Parliamentary Act whether interim or final keeping in view the provisions contained in Clause (2) of Article 226 of the Constitution of India, will have effect throughout the territory of India subject of course to the applicability of the Act.
Citations: (2004) 6 SCC 254 : AIR 2004 SC 2321
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