Wash. Admin. Code § 357-19-400
(1) When an employer uses a competitive process to make a nonpermanent appointment to fill a position in the absence of a permanent employee or fill a position nonpermanently due to the impending or actual layoff of a permanent employee(s), the employer may change the status of the appointment to probationary or to trial service if:
[Statutory Authority: Chapter 41.06 RCW. WSR 22-12-074, § 357-19-400, filed 5/27/22, effective 7/1/22. Statutory Authority: Chapter 41.06 RCW and RCW 41.06.070. WSR 21-14-042 and 22-01-153, § 357-19-400, filed 6/30/21 and 12/15/21, effective 7/1/22. Statutory Authority: Chapter 41.06 RCW. WSR 06-15-066, § 357-19-400, filed 7/13/06, effective 8/14/06; WSR 05-01-206, § 357-19-400, filed 12/21/04, effective 7/1/05.]