The federal Elementary and Secondary Education Act as amended by the Every Student Succeeds Act (ESSA) requires schools that receive Title I, Part A funds to notify parents or legal guardians when their child has been taught for four (4) consecutive weeks by a teacher who has not met "applicable State certification or licensure requirements at the grade level and subject area in which the teacher has been assigned." [ESSA Sec. 1112(e)(1)(b)(ii)]
In Washington, this notification requirement is for any teacher teaching under a
limited substitute teaching certificate (WAC 181-79A-231), such as a
Substitute certificate, Emergency Substitute certificate, or Intern Substitute Teacher certificate.