Constitution of the State of Illinois Art. I, § 7. Indictment and Preliminary Hearing

No person shall be held to answer for a criminal offense unless on indictment of a grand jury, except in cases in which the punishment is by fine or by imprisonment other than in the penitentiary, in cases of impeachment, and in cases arising in the militia when in actual service in time of war or public danger. The General Assembly by law may abolish the grand jury or further limit its use.

No person shall be held to answer for a crime punishable by death or by imprisonment in the penitentiary unless either the initial charge has been brought by indictment of a grand jury or the person has been given a prompt preliminary hearing to establish probable cause.