A more thorough explanation:

Illinois Case-Law

Illinois Case-Law refers to the collection of legal decisions made by Illinois courts. It includes rulings on various legal issues that have been brought before the courts in Illinois.

One example of Illinois Case-Law is the Italia Foods, Inc. v. Sun Tours, Inc. case. In this case, the Illinois Supreme Court held that a cause of action can be brought in Illinois state courts for unsolicited fax advertisements under the U.S. Telephone Consumer Protection Act ("TCPA"), even though Illinois state law does not specifically enable this.

Another example of Illinois Case-Law is the People v. Gersch case. In this case, the Illinois Supreme Court ruled that the use of a GPS tracking device to monitor a suspect's movements without a warrant violated the Fourth Amendment of the U.S. Constitution.

These examples illustrate how Illinois Case-Law includes a wide range of legal decisions made by Illinois courts. These decisions can have significant implications for individuals and businesses operating in Illinois, as they establish legal precedents that must be followed in future cases.