The governing board of a school district shall employ persons in public school service requiring certification qualifications as provided in this code, except that the governing board or a county office of education may contract with or employ an individual who holds a license issued by the Speech-Language Pathology and Audiology and Hearing Aid Dispensers Board and has earned a master’s degree in communication disorders to provide speech and language services if that individual meets the requirements of Section 44332.6 before employment or execution of the contract.