California Code, Business and Professions Code - BPC § 2538.18

All holders of licenses to sell or fit hearing aids shall continue their education after receiving the license. The board shall provide by regulation, as a condition to the renewal of a license, that licensees shall submit documentation satisfactory to the board that they have informed themselves of current practices related to the fitting of hearing aids by having pursued courses of study satisfactory to the board or by other means defined as equivalent by the board.

Continuing education courses shall be subject to monitoring to ensure compliance with the regulations adopted by the board pursuant to this section.