On March 1, 2024, the First District of the Illinois Appellate Court held the crime-fraud exception does not overcome the attorney-client privilege when there is not intentionally unlawful or fraudulent communication.

On Feb. 16, 2021, the Third District of the Illinois Appellate Court remanded an attorney-client-privilege case to determine whether the crime-fraud or waiver exceptions to attorney-client privilege applied when a husband underreported his income during a marriage dissolution proceeding.

On March 19, 2015, the Illinois Supreme Court held that the accountant-client privilege in the Public Accounting Act is held by the accountant and is not subject to the testamentary exception.

On December 22, 2006, the Illinois Appellate Court, First District, affirmed the Circuit Court of Cook County's dismissal of the claims against the defendant attorney because his allegedly defamatory statements were privileged and made in good faith. 

On November 5, 2004, the Illinois Appellate Court, Second District, affirmed in part, vacated in part, and remanded the Circuit Court of Lake County's decision to grant the defendant's discovery motion requesting access to communications between the plaintiff's husband and a medical malpractice attorney. 

On December 5, 2002, the Illinois Supreme Court held that the Department of Professional Regulation may not subpoena a dentist's private patient files.