63 Pa. Stat. § 9.15
The willful or knowing display or uttering by a person of a card, sign, advertisement or other printed, engraved or written instrument or device bearing a person's name in conjunction with the words "certified public accountant" or "public accountant" or any abbreviation thereof or any designation prohibited by this act, shall be prima facie evidence in any prosecution, proceeding or hearing that the person whose name is so displayed, caused or procured the display or uttering of the card, sign, advertisement or other printed, engraved, or written instrument or device and that the person is holding himself or itself out to be a certified public accountant or a public accountant. In any prosecution or proceeding under this act, evidence of the commission of a single act prohibited by this act shall be sufficient to justify an injunction or a conviction without evidence of a general course of conduct.
63 P.S. § 9.15