This would be the first time I've heard about this law but nonetheless, I don't want to get ticketed for more when I get pulled over.

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This law was probably created many years ago as WhenInYourState.com suggests but it's still in the books and active today. In Illinois it is illegal to have any obstructions hanging from your rearview mirror.

From IllinoisLawyerFinder.com:

A police officer can, by law, make a traffic stop if he or she has a reasonable suspicion that an object suspended from or placed under the rearview mirror obstructs the driver’s view. Further, an object that constitutes a “material obstruction” can indeed be considered a violation of the vehicle code and, in some cases, a violation of the criminal code. What constitutes an “obstruction” is not always clear but depends on the testimony and evidence presented at a court hearing.

And while we're on the subject, don't be dumb and hang the garter you caught at the wedding from your rearview mirror.

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