Supreme Court says police can't use your cellphone to track you without a court order

Supreme Court says police can’t use your cellphone to track you without a court order
https://www.nbcnews.com/politics/supreme-court/supreme-court-says-police-can-t-use-your-phone-track-n873156
In a 5-4 decision, the U.S. Supreme Court gave a victory to
privacy advocates on Friday, ruling that police generally must have
permission from a judge before they can get cellphone records to plot
the movements of individual customers.  The decision requires police
departments nationwide to get a search warrant in order to obtain
telephone company data to track where a user has been. The technique
is widespread, given that 95 percent of Americans own a cellphone.