Prohibits a public agency or private entity doing business in Washington from using the title of social worker or a form of the title for describing or designating volunteer or employment positions or within contracts for services, reference materials, manuals, or other documents, unless the volunteers or employees working in those positions are qualified as a social worker as defined in chapter 18.225 RCW. This prohibition does not apply to persons employed in Washington on July 1, 2009, under the job title of social worker or a form of the title, during the time of their continued employment in the same position and under the same job description and title held on July 1, 2009.