California Code, Business and Professions Code - BPC § 4982.15

(a) The board may place a license or registration on probation under the following circumstances:

(b) The board may adopt regulations establishing a monitoring program to ensure compliance with any terms or conditions of probation imposed by the board pursuant to subdivision (a). The cost of probation or monitoring may be ordered to be paid by the licensee, registrant, or applicant.

(c) The board, in its discretion, may require any licensee or registrant who has been placed on probation, or whose license or registration has been suspended, to obtain additional professional training, and to pass an examination upon completion of that training, and to pay any necessary examination fee. The examination may be written, oral, or a practical or clinical examination.