Wash. Rev. Code § 49.17.210
The director is authorized to conduct, either directly or by grant or contract, research, experiments, and demonstrations as may be of aid and assistance in the furtherance of the objects and purposes of this chapter. Employer identity, employee identity, and personal identifiers of voluntary participants in research, experiments, and demonstrations shall be deemed confidential and shall not be open to public inspection. Information obtained from such voluntary activities shall not be deemed to be medical information for the purpose of RCW 51.36.060 and shall be deemed confidential and shall not be open to public inspection. The director, in his or her discretion, is authorized to grant a variance from any rule or regulation or portion thereof, whenever he or she determines that such variance is necessary to permit an employer to participate in an experiment approved by the director, and the experiment is designed to demonstrate or validate new and improved techniques to safeguard the health or safety of employees. Any such variance shall require that all due regard be given to the health and safety of all employees participating in any experiment.
RCW 49.17.210