California Code, Labor Code - LAB § 5811

(b)(1) It shall be the responsibility of any party producing a witness requiring an interpreter to arrange for the presence of a qualified interpreter.

(2) A qualified interpreter is a language interpreter who is certified, or deemed certified, pursuant to Article 8 (commencing with Section 11435.05) of Chapter 4.5 of Part 1 of Division 3 of Title 2 of, or Section 68566 of, the Government Code. The duty of an interpreter is to accurately and impartially translate oral communications and transliterate written materials, and not to act as an agent or advocate. An interpreter shall not disclose to any person who is not an immediate participant in the communications the content of the conversations or documents that the interpreter has interpreted or transliterated unless the disclosure is compelled by court order. An attempt by any party or attorney to obtain disclosure is a bad faith tactic that is subject to Section 5813.

Interpreter fees that are reasonably, actually, and necessarily incurred shall be paid by the employer under this section, provided they are in accordance with the fee schedule adopted by the administrative director.

A qualified interpreter may render services during the following: