The controller and other officers appointed under the provisions of the section 4 of the act are empowered to exercise, perform, or discharge of the powers, duties, or functions, conferred, imposed, or assigned by or under the Immigrants and emigrants act. Powers conferred by section 2 or section 31 or section 52 should be exercised by the minister him self. (See sections 4, 5, 6, & 7 of the act. / See part II of the Immigrants and Emigrants Act for the administrative arrangements. ) Entry into Sri Lanka of persons other than citizens of Sri Lanka is controlled according to the provisions of part III of the act. This part is related to the matters connected with approved ports of entry, documents required at the entry, requirement of visa to entry into & stay in Sri Lanka, medical & other examinations upon arrival, inspection of persons & their belongings and detention & removal of certain persons from Sri Lanka. Activities of persons other than citizens of Sri Lanka during their stay are supervised under the powers conferred by the part IV of the act. Removal & deportation of persons other than citizens of Sri Lanka is carried out when necessary within the powers conferred by the parts V & VI of the act. Departure of persons from Sri Lanka is controlled by the part VII of the act. This part contains the provisions relating to the approved ports of departure, requirement of valid passport and making regulations connected to there in. The provisions of this part apply to the citizens of Sri Lanka as well as foreign nationals.