(1) Without prejudice to the provisions of section 21 of the General Clauses Act, 1897 (10 of 1897), a detention order may, at any time, be revoked or modified,—
(a) notwithstanding that the order has been made by an officer mentioned in sub-section (3) of section 3, by the State Government to which that officer is subordinate or by the Central Government;
(b) notwithstanding that the order has been made by a State Government, by the Central Government.
[(2) The expiry or revocation of a detention order (hereafter in this sub-section referred to as the earlier detention order) shall not whether such earlier detention order has been made before or after the commencement of the National Security (Second Amendment) Act, 1984 (60 of 1984)] bar the making of another detention order (hereafter in this sub-section referred to as the subsequent detention order) under section 3 against the same person:
Provided that in a case where no fresh facts have arisen after the expiry or revocation of the earlier detention order made against such person, the maximumperiod for which such person may be detained in pursuance of the subsequent detention order shall, in no case, extend beyond the expiry of a period of twelve months from the date of detention under the earlier detention order.