430 ILCS 65/2

(a)(1) No person may acquire or possess any firearm, stun gun, or taser within this State without having in his or her possession a Firearm Owner's Identification Card previously issued in his or her name by the Illinois State Police under the provisions of this Act.

(2) No person may acquire or possess firearm ammunition within this State without having in his or her possession a Firearm Owner's Identification Card previously issued in his or her name by the Illinois State Police under the provisions of this Act.

(b) The provisions of this Section regarding the possession of firearms, firearm ammunition, stun guns, and tasers do not apply to: (1) United States Marshals, while engaged in the operation of their official duties; (2) Members of the Armed Forces of the United States or the National Guard, while engaged in the operation of their official duties; (3) Federal officials required to carry firearms, while engaged in the operation of their official duties; (4) Members of bona fide veterans organizations which receive firearms directly from the armed forces of the United States, while using the firearms for ceremonial purposes with blank ammunition; (5) Nonresident hunters during hunting season, with valid nonresident hunting licenses and while in an area where hunting is permitted; (10) Nonresidents who are currently licensed or registered to possess a firearm in their resident state, where the firearm is unloaded and enclosed in a case.

(c) The provisions of this Section regarding the acquisition and possession of firearms, firearm ammunition, stun guns, and tasers do not apply to law enforcement officials of this or any other jurisdiction, while engaged in the operation of their official duties.