Wash. Rev. Code § 18.52C.030
(2) In addition to the requirements in subsection (1) of this section, a person who operates a nursing pool that employs, procures, or refers health care or long-term care personnel for temporary employment in a hospital, nursing home, assisted living facility, enhanced services facility, or an adult family home as defined in RCW 18.52C.020 shall:
[ 2023 c 100 s 2; 1996 c 191 s 28; 1991 c 3 s 131; 1988 c 243 s 3.]