Constitution of Bangladesh
PART III - FUNDAMENTAL RIGHTS
(4) No law providing for preventive detention shall authorise the detention of a person for a period exceeding six months unless an Advisory Board consisting of three persons of whom two shall be persons who are or have been or are qualified to be appointed as Judges of the Supreme Court and the other shall be a person who is a senior officer in the service of the Republic has after affording him an opportunity of being heard in person reported before the expiration of the said period of six months that there is in its opinion sufficient cause for such detention.
Fair trial standards
Rights during investigation - arbitrary arrest or detention and deprivation of liberty
EDIT.