As used in this chapter, "children in need of special education or special education and related services" means any person under the age of twenty-one years who is a resident of the State of South Dakota and who, because of his educational needs as defined by the South Dakota Board of Education Standards in rules promulgated pursuant to chapter 1-26 and this chapter, is not adequately provided for through the usual facilities and services of the school and requires special education.
SDCL 13-37-1