42 Pa.C.S. § 4414: Oath.

Before commencement of interpreter duties, an interpreter appointed under this subchapter shall take an oath or make an affirmation on the record that the interpreter will make a true interpretation to the person with limited English proficiency in the language which the person with limited English proficiency understands and that the interpreter will repeat the statements of the person with limited English proficiency to the court in English to the best of the interpreter's skill and judgment and in accordance with the code of professional conduct for court interpreters for persons with limited English proficiency.