1 Pa. C.S. § 1926 : Consolidated Statutes — GENERAL PROVISIONS — STATUTORY CONSTRUCTION — RULES OF CONSTRUCTION — CONSTRUCTION OF STATUTES — Presumption against retroactive effect TEXT PDF No statute shall be construed to be retroactive unless clearly and manifestly so intended by the General Assembly. 1 Pa.C.S. § 1926 1972, Dec. 6, P.L. 1339, No. 290, § 3, imd. effective.