All certificated state hospital or developmental center employees hired to provide educational services to individuals with exceptional needs shall possess an appropriate California credential in special education. Certificated state hospital or developmental center employees who do not possess appropriate California credentials in special education shall be reassigned to provide educational services to individuals residing in state hospitals and developmental centers who are not eligible for services under the Individuals with Disabilities Education Act (20 U.S.C. Sec. 1400 et seq.).