(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 to sub-section (2) of Section 3 by the State Government to which that officer is subordinate or by Central Government;(b)notwithstanding that the order has been made by a State Government, or by the Central Government, 33
