California Code, Education Code - EDC § 66082

(a) Each institution of public higher education shall evaluate its instructional faculty for oral and written proficiency in the English language in the classroom.  In an institution where a majority of the students speak English, if a member of the instructional faculty is unable to demonstrate proficiency in oral or written communication, he or she shall be required to improve oral and written communication skills through courses, workshops, or programs specifically designed for this purpose.

(b) Each institution shall determine its own method or process of evaluating the language proficiency of its faculty.