
A substitute is defined as "a classified or certificated employee who is employed as a substitute for an absent employee or is working in an ineligible position" for a school district or an educational service district. [ WAC 415-110-010(9)]; [ RCW 42.32.010(36)]
A substitute teacher is defined as (see RCW 41.32.010(36):
A temporary teacher is someone who has no written agreement to work for you, who reports for teaching only when contacted, and who may refuse any offer of employment.
The term ineligible position is used in SERS Plan 2 and Plan 3 and TRS Plan 2 and Plan 3 law but not in TRS Plan 1 law. An ineligible position for Plan 2 or Plan 3 is any position that normally requires fewer than five months of 70 or more hours of compensated employment during the school year (September 1-August 31).