(405 ILCS 5/1-116) (from Ch. 91 1/2, par. 1-116)
    (Text of Section before amendment by P.A. 102-972)
    Sec. 1-116. "Intellectual disability" means significantly subaverage general intellectual functioning which exists concurrently with impairment in adaptive behavior and which originates before the age of 18 years.
(Source: P.A. 97-227, eff. 1-1-12.)
 
    (Text of Section after amendment by P.A. 102-972)
    Sec. 1-116. Intellectual disability. "Intellectual disability" means a disorder with onset during the developmental period (before the individual reaches age 22), that includes both intellectual and adaptive deficits in conceptual, social and practical domains. The following 3 criteria must be met: (1) deficits in intellectual functions such as reasoning, problem solving, planning, abstract thinking, judgment, academic learning, and learning from experience confirmed by both clinical assessment and individualized, standardized intelligence testing (generally indicated with an IQ score of about 70 or below), (2) deficits in adaptive functioning that result in failure to meet developmental and sociocultural standards for personal independence and social responsibility. Without ongoing support, the adaptive deficits limit functioning in one or more activities of daily life, such as communication, social participation, and independent living, across multiple environments, such as home, school, work, and community, and (3) onset of intellectual and adaptive deficits during the developmental period. This definition does not supersede the "intellectual disability" definition in Section 1.1 of the Firearm Owners Identification Card Act which is required to be applied under that Act for the purpose of mandatory reporting.
(Source: P.A. 102-972, eff. 1-1-23.)