Section 28
SEC. 28. No person shall be excused from testifying or from producing any book, document, or paper in any investigation or inquiry by or upon the hearing before said Board or any member thereof, when ordered so to do by the Board or any member thereof upon the ground that the testimony or evidence, book, document, or paper required of him may tend to incriminate him or subject him to penalty or forfeiture, but no person shall be prosecuted, punished, or subjected to any penalty or forfeiture for or on account of any act, transaction, matter, or thing concerning which he shall, under oath, have testified or produced documentary evidence: Provided, however, That no person so testifying shall be exempt from prosecution or punishment for any perjury committed by him in his testimony. Nothing herein contained is intended to give, or shall be construed in any manner as giving, to any corporation immunity of any kind. No member or employee of the Board shall be required to give testimony in any civil suit to which the Board is not a party, with regard to information obtained by him in the discharge of his official duty.