430 ILCS 65/1.1

"Addicted to narcotics" means a person who has been:

(1) convicted of an offense involving the use or possession of cannabis, a controlled substance, or methamphetamine within the past year; or
(2) determined by the Illinois State Police to be addicted to narcotics based upon federal law or federal guidelines. "Addicted to narcotics" does not include possession or use of a prescribed controlled substance under the direction and authority of a physician or other person authorized to prescribe the controlled substance when the controlled substance is used in the prescribed manner.
"Adjudicated as a person with a mental disability" means the person is the subject of a determination by a court, board, commission or other lawful authority that the person, as a result of marked subnormal intelligence, or mental illness, mental impairment, incompetency, condition, or disease:
(1) presents a clear and present danger to himself, herself, or to others;
(2) lacks the mental capacity to manage his or her own affairs or is adjudicated a person with a disability as defined in Section 11a-2 of the Probate Act of 1975;
(3) is not guilty in a criminal case by reason of insanity, mental disease or defect;
(3.5) is guilty but mentally ill, as provided in Section 5-2-6 of the Unified Code of Corrections;
(4) is incompetent to stand trial in a criminal case;
(5) is not guilty by reason of lack of mental responsibility under Articles 50a and 72b of the Uniform Code of Military Justice, 10 U.S.C. 850a, 876b;
(6) is a sexually violent person under subsection (f) of Section 5 of the Sexually Violent Persons Commitment Act;
(7) is a sexually dangerous person under the Sexually Dangerous Persons Act;
(8) is unfit to stand trial under the Juvenile Court Act of 1987;
(9) is not guilty by reason of insanity under the Juvenile Court Act of 1987;
(10) is subject to involuntary admission as an inpatient as defined in Section 1-119 of the Mental Health and Developmental Disabilities Code;
(11) is subject to involuntary admission as an outpatient as defined in Section 1-119.1 of the Mental Health and Developmental Disabilities Code;
(12) is subject to judicial admission as set forth in Section 4-500 of the Mental Health and Developmental Disabilities Code; or
(13) is subject to the provisions of the Interstate Agreements on Sexually Dangerous Persons Act. "Advanced practice psychiatric nurse" has the meaning ascribed to that term in Section 1-101.3 of the Mental Health and Developmental Disabilities Code.
"Clear and present danger" means a person who:
(1) communicates a serious threat of physical violence against a reasonably identifiable victim or poses a clear and imminent risk of serious physical injury to himself, herself, or another person as determined by a physician, clinical psychologist, advanced practice psychiatric nurse, or qualified examiner; or
(2) demonstrates threatening physical or verbal behavior, such as violent, suicidal, or assaultive threats, actions, or other behavior, as determined by a physician, clinical psychologist, advanced practice psychiatric nurse, qualified examiner, school administrator, or law enforcement official. "Clinical psychologist" has the meaning provided in Section 1-103 of the Mental Health and Developmental Disabilities Code.
"Controlled substance" means a controlled substance or controlled substance analog as defined in the Illinois Controlled Substances Act.
"Counterfeit" means to copy or imitate, without legal authority, with intent to deceive.
"Developmental disability" means a severe, chronic disability of an individual that:
(1) is attributable to a mental or physical impairment or combination of mental and physical impairments;
(2) is manifested before the individual attains age 22;
(3) is likely to continue indefinitely;
(4) results in substantial functional limitations in 3 or more of the following areas of major life activity:
1. (A) Self-care.
2. (B) Receptive and expressive language.
3. (C) Learning.
4. (D) Mobility.
5. (E) Self-direction.
6. (F) Capacity for independent living.
7. (G) Economic self-sufficiency; and
(5) reflects the individual's need for a combination and sequence of special, interdisciplinary, or generic services, individualized supports, or other forms of assistance that are of lifelong or extended duration and are individually planned and coordinated. "Federally licensed firearm dealer" means a person who is licensed as a federal firearms dealer under Section 923 of the federal Gun Control Act of 1968 (18 U.S.C. 923).
"Firearm" means any device, by whatever name known, which is designed to expel a projectile or projectiles by the action of an explosion, expansion of gas or escape of gas; excluding, however:
(1) any pneumatic gun, spring gun, paint ball gun, or B-B gun which expels a single globular projectile not exceeding .18 inch in diameter or which has a maximum muzzle velocity of less than 700 feet per second;
(1.1) any pneumatic gun, spring gun, paint ball gun, or B-B gun which expels breakable paint balls containing washable marking colors;
(2) any device used exclusively for signaling or safety and required or recommended by the United States Coast Guard or the Interstate Commerce Commission;
(3) any device used exclusively for the firing of stud cartridges, explosive rivets or similar industrial ammunition; and
(4) an antique firearm (other than a machine-gun) which, although designed as a weapon, the Illinois State Police finds by reason of the date of its manufacture, value, design, and other characteristics is primarily a collector's item and is not likely to be used as a weapon. "Firearm ammunition" means any self-contained cartridge or shotgun shell, by whatever name known, which is designed to be used or adaptable to use in a firearm; excluding, however:
(1) any ammunition exclusively designed for use with a device used exclusively for signaling or safety and required or recommended by the United States Coast Guard or the Interstate Commerce Commission; and
(2) any ammunition designed exclusively for use with a stud or rivet driver or other similar industrial ammunition. "Gun show" means an event or function:
(1) at which the sale and transfer of firearms is the regular and normal course of business and where 50 or more firearms are displayed, offered, or exhibited for sale, transfer, or exchange; or
(2) at which not less than 10 gun show vendors display, offer, or exhibit for sale, sell, transfer, or exchange firearms. "Gun show" includes the entire premises provided for an event or function, including parking areas for the event or function, that is sponsored to facilitate the purchase, sale, transfer, or exchange of firearms as described in this Section. Nothing in this definition shall be construed to exclude a gun show held in conjunction with competitive shooting events at the World Shooting Complex sanctioned by a national governing body in which the sale or transfer of firearms is authorized under subparagraph (5) of paragraph (g) of subsection (A) of Section 24-3 of the Criminal Code of 2012.
Unless otherwise expressly stated, "gun show" does not include training or safety classes, competitive shooting events, such as rifle, shotgun, or handgun matches, trap, skeet, or sporting clays shoots, dinners, banquets, raffles, or any other event where the sale or transfer of firearms is not the primary course of business.
"Gun show promoter" means a person who organizes or operates a gun show.
"Gun show vendor" means a person who exhibits, sells, offers for sale, transfers, or exchanges any firearms at a gun show, regardless of whether the person arranges with a gun show promoter for a fixed location from which to exhibit, sell, offer for sale, transfer, or exchange any firearm.
"Intellectual disability" means significantly subaverage general intellectual functioning, existing concurrently with deficits in adaptive behavior and manifested during the developmental period, which is defined as before the age of 22, that adversely affects a child's educational performance.
"Involuntarily admitted" has the meaning as prescribed in Sections 1-119 and 1-119.1 of the Mental Health and Developmental Disabilities Code.
"Mental health facility" means any licensed private hospital or hospital affiliate, institution, or facility, or part thereof, and any facility, or part thereof, operated by the State or a political subdivision thereof which provides treatment of persons with mental illness and includes all hospitals, institutions, clinics, evaluation facilities, mental health centers, colleges, universities, long-term care facilities, and nursing homes, or parts thereof, which provide treatment of persons with mental illness whether or not the primary purpose is to provide treatment of persons with mental illness.
"National governing body" means a group of persons who adopt rules and formulate policy on behalf of a national firearm sporting organization.
"Noncitizen" means a person who is not a citizen of the United States, but is a person who is a foreign-born person who lives in the United States, has not been naturalized, and is still a citizen of a foreign country.
"Patient" means:
(1) a person who is admitted as an inpatient or resident of a public or private mental health facility for mental health treatment under Chapter III of the Mental Health and Developmental Disabilities Code as an informal admission, a voluntary admission, a minor admission, an emergency admission, or an involuntary admission, unless the treatment was solely for an alcohol abuse disorder; or
(2) a person who voluntarily or involuntarily receives mental health treatment as an out-patient or is otherwise provided services by a public or private mental health facility and who poses a clear and present danger to himself, herself, or others. "Physician" has the meaning as defined in Section 1-120 of the Mental Health and Developmental Disabilities Code.
"Protective order" means any orders of protection issued under the Illinois Domestic Violence Act of 1986, stalking no contact orders issued under the Stalking No Contact Order Act, civil no contact orders issued under the Civil No Contact Order Act, and firearms restraining orders issued under the Firearms Restraining Order Act or a substantially similar order issued by the court of another state, tribe, or United States territory or military judge.
"Qualified examiner" has the meaning provided in Section 1-122 of the Mental Health and Developmental Disabilities Code.
"Sanctioned competitive shooting event" means a shooting contest officially recognized by a national or state shooting sport association, and includes any sight-in or practice conducted in conjunction with the event.
"School administrator" means the person required to report under the School Administrator Reporting of Mental Health Clear and Present Danger Determinations Law.
"Stun gun or taser" has the meaning ascribed to it in Section 24-1 of the Criminal Code of 2012.

(Source: P.A. 103-154, eff. 6-30-23; 103-407, eff. 7-28-23; 104-270, eff. 8-15-25.)