Wash. Rev. Code § 49.17.490
(1) Before the assignment of an employee to a worksite employer, a staffing agency must:
(3) Before the employee engages in work for the worksite employer, the worksite employer must:
(4) If the worksite employer changes the job tasks or work location and new hazards may be encountered, the worksite employer must:
(7) The definitions in this subsection apply throughout this section unless the context clearly requires otherwise.
(a) A "staffing agency" is an employer as defined in this chapter and North American industry classification system 561320 and means an organization that recruits and hires its own employees and temporarily assigns those employees to perform work or services for another organization, under such other organization's supervision, to:
[ 2021 c 37 s 1.]