24 Pa. Stat. § 12-1202
State certificates shall be issued as herein provided. Each such certificate shall set forth the branches which its holder is entitled to teach. No teacher shall teach, in any public school, any branch which he has not been properly certificated to teach.
A certificate to teach shall not be granted or issued to any person not a citizen of the United States, except in the case of exchange teachers not permanently employed and teachers employed for the purpose of teaching foreign languages.
In the case of a resident foreign national holding an immigrant visa who has declared, in writing, to the Department of Public Instruction the intention of becoming a citizen of the United States, such person shall be eligible for a provisional college certificate.
24 P.S. § 12-1202