101 Pa. Code § 23.115
A preamble placed before the enacting clause or contained in a non-amendatory section in a bill amending the Statutes will not be incorporated into the Statutes and will eventually lose its identity. Therefore, to insure the incorporation of the provisions of a proposed preamble into the body of the Statutes and thus preserve its identity and usefulness, it will be necessary to make it a section or part of a section contained in or to be added to the Statutes in the form of a declaration of policy, legislative finding or otherwise. However, the use of preambles, in any form, is to be discouraged and should only be used when insisted upon by a member.
101 Pa. Code § 23.115
This section cited in 101 Pa. Code § 25.22 (relating to elimination of departures from uniform style of the Statutes).