Section 18: Witnesses in causes heard in original jurisdiction.

(1) For the purpose of any cause before the Supreme Court in its original jurisdiction the Court may require the attendance of persons to give evidence or to produce documents or both.
(2) Any person present in court during the hearing of any such cause may, if the Court thinks fit, be ordered to give evidence or to produce documents.
(3) A Justice of the Supreme Court, if it appears to him that the attendance of any person confined in any part of the Federation as a prisoner under any sentence or order or commitment for trial or otherwise, or under civil process, is necessary for the purpose of obtaining evidence in any such cause as aforesaid pending or to be inquired of in the court, may issue a warrant for bringing up the said person before the Court and the superintendent of the prison or other officer in whose custody the person is shall forthwith obey such warrant.