Brief, concise written notes may be helpful. ASL is not a universal language. ASL is a language with its own syntax and grammatical structure. When scheduling an interpreter for a non-English speaking person, be certain to retain an interpreter that speaks and interprets in the language of the person. If an interpreter is present, it is commonplace for the interpreter to be seated beside the interviewer, across from the interviewee.
Interpreters facilitate communication.
They should not be consulted or regarded as a reference for the interview.