(1) A person is eligible for services under this title if the secretary finds that the person has a developmental disability as defined in RCW 71A.10.020.
(2) The secretary may adopt rules further defining and implementing the criteria in the definition of "developmental disability" under RCW 71A.10.020. Beginning July 1, 2025, the administration may not use intelligence quotient scores as a determinant of developmental disability. The administration shall maintain eligibility for the administration's services for any persons determined eligible after the age of 18 who were determined eligible using an intelligence quotient score under criteria in place prior to July 1, 2025. The administration shall not disenroll any client upon review at 18 years old who is determined to be eligible based on standards in place prior to or after July 1, 2025.