On Oct. 21, 2021, the Illinois Supreme Court held that the fruit-of-the-poisonous-tree doctrine did not apply when a video recording was created simultaneously with an illegal audio recording because the video could not have been derived from the audio.

On Aug. 21, 2020, the Third District of the Illinois Appellate Court held that evidence obtained through violation of the Illinois eavesdropping statute must be suppressed, including testimony about illegally recorded conversations prompted by illegal recording devices.

The Criminal Code has been amended to preclude civil remedies or causes of action against parents, grandparents, or other guardians for eavesdropping on a minor's electronic communications by accessing...The Criminal Code has been amended to preclude civil remedies or causes of action against parents, grandparents, or other guardians for eavesdropping on a minor's electronic communications by accessing the minor's account if done during the guardian's exercise of supervision while the minor is in their "care, custody, or control."

On February 7, 2008, the Illinois Supreme Court affirmed the order of the Circuit Court of Du Page County refusing to suppress evidence obtained in violation of the Illinois eavesdropping statute, 720 ILCS 5/14-2. 

On June 23, 2006, the Illinois Appellate Court, First District, affirmed the decision of the Circuit Court of Cook County, holding transcriptions of instant message communications were not obtained in violation of Illinois' eavesdropping statute.

On April 17, 2003, the Illinois Supreme Court upheld the defendant's conviction of murder in the first degree and of unlawful possession of a stolen or converted motor vehicle.

On November 21, 2001, the Department of State Police (department) adopted several amendments to section 1295 of the Illinois Administrative Code. 20 Ill Adm Code 1295.

P.A. 91-657 makes several changes to the eavesdropping sections of the Illinois Criminal Code, 720 ILCS 5/14-1 et seq. The act also closes a loophole and makes additional amendments.