"Authorizing OnStar agents to activate the system within a suspect’s car renders statutory authority null. It effectively makes every single General Motors vehicle and every OnStar service representative an agent of the government."

http://www.forbes.com/sites/thomasbrewster/2017/01/15/police-spying-on-car-conversations-location-siriusxm-gm-chevrolet-toyota-privacy/#44668a1e649b