Wash. Admin. Code § 357-22-040
(1) Information must be kept in the employee's personnel file as long as it has a reasonable bearing on:
(2) Adverse material proven to be inaccurate or false, or information related to employee misconduct or alleged misconduct which is determined to be false, and all such information in situations where the employee has been fully exonerated of wrong doing must be promptly destroyed unless:
[Statutory Authority: Chapter 41.06 RCW. WSR 05-01-198, § 357-22-040, filed 12/21/04, effective 7/1/05.]