United States Code/Title 5/Chapter 5/Section 503

ยง 503. Witness fees and allowances

(a) For the purpose of this section, ``agency has the meaning given it by section 5721 of this title.
(b) A witness is entitled to the fees and allowances allowed by statute for witnesses in the courts of the United States when--
(1) he is subpenaed under section 304(a) of this title; or
(2) he is subpenaed to and appears at a hearing before an agency authorized by law to hold hearings and subpena witnesses to attend the hearings.