4 Pa. Code § 610.3 – Selective criteria.

(a) Generally. Upon the request of an appointing authority, the Office of Administration may restrict certification or referral for a position based on selective criteria.
(b) Basis for selective criteria. Selective criteria shall be based on merit-related factors deemed necessary to the operational needs of the appointing authority and in the interest of the service to the Commonwealth. Selective criteria may include a bona fide occupational qualification deemed necessary for employment in a specific position, or other factors necessary to comply with Federal and State laws and regulations.
(c) Request. A request to restrict application for a position based on selective criteria shall be submitted in the manner prescribed by the Office of Administration.

This section cited in 4 Pa. Code § 610.6 (relating to evaluation of applications).