In section 16A of the principal Act, (a) after sub section (2), the following sub section shall be inserted, and shall be deemed to have been inserted with effect from the 29th day of June, 1975, namely: '(2A) If the State Government makes a declaration under sub section (2) that the detention of any person in respect of whom a detention order is made by an officer subordinate to that Government is necessary for dealing effectively with the emergency, the State Government shall be 257 deemed to have approved such detention order and the provisions of sub section (3) of section 3, in so far as they relate to the approval of the State Government, and of sub section (4) of that section, shall not apply to such detention order. '; (b) for sub section (5), the following sub section shall be substituted, and shall be deemed to have been substituted with effect from the 29th day of June, 1975, namely: '(5) In making any review, consideration or reconsideration under sub section (2), sub section (3) or sub section (4), the appropriate Government or officer may act on the basis of the information and materials in its or his possession without communicating or disclosing any such information or materials to the person concerned or affording him any opportunity of making any representation against the making under sub section (2), or the making or confirming under sub section (3), or the non revocation under sub section (4), of the declaration in respect of him.