Michigan (and maybe other states) is paying a private company to track all that data so if someone contracts a disease, the government can see where he or she has been recently

They say it will be optional to be tracked this way, and it's only to inform the public that so-and-so went to the market and the theatre, but I don't trust the government to tell the truth about intelligence-gathering operations. It's only a matter of time before they argue that Public Health demands they coordinate those movements with all the other cellphones to see who should be visited for testing "or else"