The testimony of any witness or party may be taken by deposition or
interrogatory according to the rules of practice of the Federal
district court for the judicial district in which the case is pending
(or of the U.S. District Court for the District of Columbia if the case
is pending in the District or outside the United States), except that
at least 30 days prior notice of any deposition shall be given to all
parties unless such notice is waived. No post-hearing deposition or
interrogatory shall be permitted unless authorized by the
administrative law judge upon the motion of a party to the claim. The
testimony of any physician which is taken by deposition shall be
subject to the limitations on the scope of the testimony contained in
Sec. 725.457(d).
