No person sworn and examined before I Liheslaturan Guåhan, or a Committee, shall be immune from criminal prosecution by reason thereof, nor shall any document or thing produced by such witness be excluded by reason of such production from use in any subsequent criminal proceeding; provided, however, that I Liheslaturan Guåhan, or Committee, may, by majority vote of all its respective Members, grant partial or absolute immunity to such witness who shall thereafter be compelled to testify on penalty of contempt. No witness so compelled shall be held to answer criminally or be subject to any penalty or forfeiture for any fact or act touching which the witness is required to testify, nor shall any document or thing produced by such witness be competent evidence in any criminal proceeding against the witness. Nothing in this Section exempts any witness from prosecution and punishment for perjury committed by the witness on examination.