A witness, whether a party or not, who resides or is employed in this state may be subpoenaed to attend a trial or hearing wherever held in this state. No subpoena shall issue to compel the attendance of such a witness who resides and is employed outside the parish and more than twenty-five miles from the courthouse where the trial or hearing is to be held, unless the provisions of R.S. 13:3661 are complied with.