- Article 249 of the Indian Constitution empowers the Parliament to legislate on a subject enumerated in the State List if the Rajya Sabha passes a resolution by a special majority (two-thirds of members present and voting) declaring that it is necessary or expedient in the national interest. - This resolution remains in force for a specified period, which is not exceeding one year. - After the expiry of this period, Parliament can cease to legislate on the subject, or the Rajya Sabha can pass another resolution to extend the period. - A law made by Parliament under this article shall cease to have effect on the expiration of six months after the resolution has ceased to be in force, except as respects things done or omitted to be done before the expiration of the said period.