10 CAP. 172 Immigration [Rev. 2010 transport and maintenance of that person and his removal from Kenya, and the amount of such expenses shall be a civil debt recoverable summarily at the suit of the Minister. (4) Any person who is taken into the custody of the master of a ship, the captain of an aircraft or the guard of a train pursuant to this section shall be deemed to be in lawful custody while he is in Kenya. Administration, Offences and Legal Proceedings Immigration officers. 10. (1) There shall be such number of immigration officers as may be necessary for the purposes of this Act. (2) In the performance of their functions under this Act, immigration officers shall act in accordance with such instructions as may be given by the Minister. Powers of immigration officers. 11. (1) For the purposes of any of his functions under this Act, an immigration officer shall have power– (a) to board, or enter, and search any ship, aircraft, train or vehicle in Kenya; (b) to require any person seeking to enter Kenya to answer any question or to produce any document in his possession for the purpose of ascertaining whether that person is or is not a citizen of Kenya and, in the case of any person who is not a citizen of Kenya, for the purpose of determining whether that person should be permitted to enter Kenya under this Act; (c) to require any person seeking to enter or leave Kenya to produce to him a valid passport and any form of declaration that may be prescribed; (d) to require any person seeking to enter Kenya to submit to examination by a medical practitioner. (2) An immigration officer investigating any offence or suspected offence under this Act shall have all the powers and immunities conferred by law on a police officer for the purpose of the investigation. Power of arrest and search of persons. Cap. 75. 12. (1) An immigration officer or a police officer who has reasonable cause to suspect that a person has committed an offence under this Act, or is unlawfully present in Kenya, may, if it appears to him to be necessary to do so in order to secure that the purposes of this Act shall not be defeated, arrest that person without warrant; and sections 33 and 36 of the Criminal Procedure Code shall apply to that