Save as otherwise expressly provided in this Act, in every case where a detention order has been made under this Act, the appropriate Government shall, within three weeks from the date of detention of a person under the order, place before the Advisory Board constituted by it under section 9, the grounds on which the order has been made and the representation, if any, made by the person affected by the order, and in case where the order has been made by an officer mentioned in sub-section (3) of section 3, also the report by such officer under sub-section (4) of that section.