(4)No law providing for preventive detention shall authorise the detention of a person for a longer period than three months unless-(a)an Advisory Board consisting of persons who are, or have been, or are qualified to be appointed as, Judges of a High Court has reported before the expiration of the said period of three months that there is in its opinion sufficient cause for such detention:Provided that nothing in this sub-clause shall authorise the detention of any person beyond the maximum period prescribed by any law made by Parliament under sub-clause (b) of clause (7); or(b)such person is detained in accordance with the provisions of any law made by Parliament under sub-clauses (a) and (b) of clause (7).
