Cal. Bus. & Prof. Code § 2539.6
(a) Whenever any of the following conditions are found to exist either from observations by the licensed audiologist or on the basis of information furnished by the prospective hearing aid user, a licensed audiologist shall, prior to fitting or selling a hearing aid to any individual, suggest to that individual in writing that the individual’s best interests would be served if they consult a licensed physician and surgeon specializing in diseases of the ear or, if none are available in the community, a duly licensed physician and surgeon: