In accordance with RCW 49.58.100, an employer may not:

(1) Seek the wage or salary history of an individual applying for employment, including current employees, from the individual or the individual's current or former employer; or

(2) Require that an individual's prior wage or salary history meet certain criteria, except as provided in WAC 357-16-220.

For the purposes of this section "employer" also includes those employers with fewer than fifteen employees.