(a) Witnesses at the hearing shall testify under oath or
affirmation. The administrative law judge may examine the witnesses and
shall allow the parties or their representatives to do so.
(b) No person shall be required to attend as a witness in any
proceeding before an administrative law judge at a place more than 100
miles from his place of residence, unless his lawful mileage and fees
for one day's attendance shall be paid or tendered to him in advance of
the hearing date.
