WAC 296-123-070

(1) An employer may not retaliate, discharge, or otherwise discriminate against an employee because the employee has filed any complaint, or instituted or caused to be instituted any proceeding under this chapter, or has testified or is about to testify in any such proceeding, or because of the exercise by such employee on behalf of themselves or others of any right afforded by this chapter.

(2) An employer may not interfere with, restrain, or deny the exercise of any employee right provided under or in connection with chapter 49.58 RCW or associated rules. An employer may not use an employee's exercise of any of the rights provided under chapter 49.58 RCW or associated rules as a negative factor in any employment action such as evaluation, promotion, or termination, or otherwise subject an employee to discipline for the exercise of any rights provided under chapter 49.58 RCW or associated rules.