Whenever, on or after September 15, 1961, a person has rendered service in a position requiring certification qualifications, or the governing board of a district has employed a person in a position requiring certification qualifications, or the county superintendent has drawn an order for a warrant in favor of a person in a position requiring certification qualifications, for a period of service during which the person did not have a valid credential required for such position in force as required by law, and when as a result thereof the employment of the person to render such service, the rendering of such service, the inclusion of the attendance of pupils taught by the person in the average daily attendance of the district, or the drawing of the order warrant for the service of such person, is in violation of Section 46300, 44830, 45034 or any other provision of this code, such employment, rendering of service, inclusion of attendance, or drawing of the order for the warrant shall be deemed fully legal for all purposes if the Commission for Teacher Preparation and Licensing approves thereof in accordance with this section.
The Commission for Teacher Preparation and Licensing shall adopt rules and regulations to establish procedures for a review in such cases and shall determine whether the rendering of such service shall be approved and made fully legal for all purposes. If the commission gives its approval to the rendering of such service, then such employment, inclusion of attendance, and drawing of the order for the warrant shall be automatically approved and made fully legal for all purposes.
The commission shall not approve of the rendering of such service unless it determines that the person rendering the service had, in fact, the necessary qualifications, during the period of service in question, for the credential required by law for the position in which the service was rendered, and unless a valid credential required for such position has been issued to such person prior to review and action by the commission.