28 Pa. Code § 711.15 – Right to enter and inspect.

(a) For the purpose of determining continuing conformity of the holder of the certificate of compliance to this title, an authorized representative of the Department has a right to enter, visit and inspect a facility licensed/approved or applying for a certificate of compliance under this chapter.
(b) The authorized Department representative shall have full and free access to the records of the facility and its clients.
(c) The authorized Department representative has the right to interview clients as part of the visitation and inspection process.

This section cited in 28 Pa. Code § 715.3 (relating to approval of narcotic treatment programs).