210 Pa. Code Rule 521
(b) Status of Attorney General.—The Attorney General may be heard on the question of the constitutionality of the statute involved without formal intervention. If the Attorney General files a brief concerning the question the Commonwealth shall thereafter be deemed to be an intervening party in the matter.
Note
Based on Pa.R.Civ.P. 235 and Fed. Rules App. Proc. 44. The provisions of subdivision (b) are intended to place the Commonwealth in a position to obtain review in the Supreme Court of Pennsylvania or the Supreme Court of the United States of an adverse decision on the constitutional question.