ยง  261.  Subpoena on application for executive clemency.  The governor
  shall have the power in any matter  pertaining  to  an  application  for
  clemency,  to  issue  a  subpoena  to  compel the attendance of a person
  before him at a time and place designated in said subpoena; and he shall
  also have the power to compel the  production  of  any  book,  paper  or
  writing by a subpoena duces tecum, directed to a person in whose custody
  either  may be, at a time and place designated in said subpoena. But the
  provisions of this article shall not apply to any book, paper or writing
  filed in any office of record in any civil division of this state.