There’s been talk of using digital license plates with built-in GPS tracking to catch carjackers in Chicago. 

Dixon Republican St. Rep. Tom Demmer has filed House Bill 4105 to prevent that. He says it's one thing for people to decide on their own to use GPS trackers on their vehicles. It's another altogether to empower the state to monitor everyone's movements.

Demmer says besides the cost of the plates, it may be expensive developing the infrastructure to handle all the data.