This page is a summary of the ASL-English Interpreter requirements in PA, and the general process of obtaining a national certification from the Registry of Interpreters of the Deaf.
A summary of these three laws can be found here.
Being native users of American Sign Language enables Deaf interpreters to provide interpretations that are more comprehensible to native users (McDermid, 2010).
Interpretation effectiveness increases with both experience and training (NCIEC, 2016).
RID's Standard Practice paper on CDI's
CASLI's eligibility requirements