24 Pa. Stat. § 12-1215
A temporary substitute teacher certificate may be issued by a public school entity to an individual who presents a letter from a college or university verifying that the individual has completed an approved teacher preparation program, has successfully completed the certification testing requirements or is in the process of scheduling the required certification testing and has completed all requirements for the awarding of a bachelor's degree on a date certain. The temporary substitute teacher certificate shall only be used for day-to-day assignments and shall expire upon the termination of any summer school conducted in the summer which follows the date of issuance or upon the receipt of instructional I certification by the individual. For the 2021-2022 and 2022-2023 school years, the temporary substitute teacher certificate issued under this section may be used for assignments of more than twenty (20) consecutive days to fill a position due to the absence of professional certified personnel.
24 P.S. § 12-1215