720 ILCS 5/31-4.5: Obstructing identification.

(a) A person commits the offense of obstructing identification when he or she intentionally or knowingly furnishes a false or fictitious name, residence address, or date of birth to a peace officer who has:

(1) lawfully arrested the person;

(2) lawfully detained the person; or

(3) requested the information from a person that the peace officer has good cause to believe is a witness to a criminal offense.

(b) Sentence. Obstructing identification is a Class A misdemeanor.