As used in this chapter:
(1) "Intellectually disabled" means:
(a) significant subaverage general intellectual functioning that exists concurrently with significant deficiencies in adaptive functioning; and
(b) the subaverage general intellectual functioning and the significant deficiencies in adaptive functioning described in Subsection (1)(a) are both manifested before the individual is 22 years old.
(2) "Prescreening psychologist" means a psychologist who:
(a) is licensed in accordance with Title 58, Chapter 61, Psychologist Licensing Act; and
(b) has at least five years of experience in testing, evaluating, and diagnosing individuals as intellectually disabled.