1 Pa. Code § 35.139
Witnesses subpoenaed by the agency shall be paid the same fees and mileage as are paid for like services in the courts of common pleas. Witnesses subpoenaed at the instance of participants shall be paid the same fees by the participant at whose instance the witness is subpoenaed; and the agency, before issuing any subpoena as provided in § 35.142(a) (relating to subpoenas), may require a deposit of an amount adequate to cover the fees and mileage involved.
1 Pa. Code § 35.139
This section cited in 1 Pa. Code § 35.142 (relating to subpoenas); 4 Pa. Code §105.14a (relating to subpoenas); 4 Pa. Code §265.3 (relating to level II hearings); 7 Pa. Code §179.10 (relating to subpoena powers and procedures); 22 Pa. Code §201.7 (relating to service and return of subpoenas); 25 Pa. Code §1021.103 (relating to subpoenas, notices to attend and notices to produce); 25 Pa. Code §1021.123 (relating to evidence); 34 Pa. Code §95.95 (relating to witnesses and subpoenas); 34 Pa. Code §131.81 (relating to subpoenas); 34 Pa. Code §131.204 (relating to UEGF subpoenas and interrogatories); 37 Pa. Code §21.58 (relating to witness fees); 37 Pa. Code §171.134 (relating to witness fees and mileage allowance); 55 Pa. Code §41.161 (relating to written testimony); and 61 Pa. Code §703.34 (relating to hearing procedure).