11 Pa.C.S. § 11704.12: Powers and duties of independent auditor.

(a) Annual audit.--The independent auditor shall conduct an annual audit of all accounts of city officers, departments and offices which collect, receive and disburse public money or are authorized with the management, control or custody of public money on which the independent auditor is required to report under this subchapter. The annual audit, as directed by council, shall also include any accounts subject to examination by the city controller under Subchapter A (relating to city controller).

(b) Subpoenas.--The independent auditor may issue subpoenas to obtain the attendance of officers whose accounts the independent auditor is authorized to examine and any other individuals whom it may be necessary to examine as witnesses.