In this case, the La Salle County State’s Attorney in essence started its own drug interdiction unit and had its investigators conduct traffic stops and its own criminal investigations separate and apart from local or State police.
The Defendant filed a motion to suppress after a traffic stop produced evidence, arguing among other things that the State’s Attorney’s Office had no legal authority in its statute to set this up in the first place.
The trial court and the appellate court agreed, and so did the Illinois Supreme Court.
The case is People v. Cara Ringland.
http://www.illinoiscourts.gov/Opinions/SupremeCourt/2017/119484.pdf