16 Pa. Stat. § 7514
No State police, sheriff, deputy sheriff, constable, deputy constable, detective, police or other peace officer of this Commonwealth, or of any political subdivision thereof, (collectively referred to in this act as "officers"), shall perform, directly or indirectly, any official services or official duties for any person, association or corporation, or receive, directly or indirectly, any compensation, gifts or gratuities from any person, association or corporation during the period of his official services: Provided, however, That nothing herein contained shall prohibit such officers from serving writs and other legal process as now authorized by law. Any compensation payable to any officer for official duties and services shall be paid only out of the public funds, to the amount and in the manner prescribed by law. Gifts, donations, and gratuities of any nature whatsoever made by any person, association or corporation to the Commonwealth, or any political subdivision thereof, or any official or agent thereof, shall not constitute public funds within the meaning of this section.
The Commonwealth, or any political subdivision thereof, or any official or agent thereof, shall not accept as a gratuity, gift or donation any arms, ammunition, military supplies, tear gas or equipment or supplies or articles of a similar character from, nor shall any such gratuity, gift or donation be made by, any person, association or corporation.
Any and all contracts or agreements, whether written or oral, express or implied, heretofore or hereafter made and entered into between the Commonwealth, or any political subdivision thereof, or any official or agent thereof, and any person, association or corporation in violation of any provision of this section, are hereby declared to be contrary to public policy and void, and no such contract or agreement shall afford any basis for the granting of legal or equitable relief by any court.
16 P.S. § 7514