California Code, Business and Professions Code - BPC § 7156

(a) For any home improvement salesperson to fail to account for or to remit to their employing contractor any payment received in connection with any home improvement transaction or any other transaction involving a work of improvement.

(b) For any person to use a contract form in connection with any home improvement transaction or any other transaction involving a work of improvement if the form fails to disclose the name of the contractor principal by whom the person is employed.

(c) For any home improvement salesperson to assist, recommend, select, or otherwise guide an owner or tenant in the selection of a contractor for the performance or sale of home improvement goods or services if notification of employment by the home improvement contractor, as required by subdivision (a) of Section 7154, has not been received by the Board.