§ 5711. Authority to issue subpoenas
(a)
For the purposes of the laws administered by the Secretary, the Secretary, and those employees to whom the Secretary may delegate such authority, to the extent of the authority so delegated, shall have the power to—
(b)
Any person required by such subpoena to attend as a witness shall be allowed and paid the same fees and mileage as are paid witnesses in the district courts of the United States.