(a) The arbitrators may authorize a deposition:
(1) for use as evidence to be taken of a witness who cannot be required by subpoena to appear before the arbitrators or who is unable to attend the hearing; or
(2) for discovery or evidentiary purposes to be taken of an adverse witness.
(b) A deposition under this section shall be taken in the manner provided by law for a deposition in a civil action pending in a district court.