The Florida Supreme Court ruled, in Tracey v. State, that police must obtain a search warrant to obtain real-time cell-site location data from a cell service provider and use it to track a suspect.  Courts have been divided over whether a warrant is required for cell-site location data, with some courts saying no warrant is required because people lack a reasonable expectation of privacy in data disclosed to a third party, including a communications provider.  But the Florida court reasoned that such information should be considered private even if it is disclosed to a third party, and even if a person travels only in public areas where he can be observed by anyone.  The court reasoned that “because cell phones are indispensable to so many people and are normally carried on one’s person, cell phone tracking can easily invade the right to privacy in one’s home or other private areas, a matter that the government cannot always anticipate and one which, when it occurs, is clearly a Fourth Amendment violation.”