The Supreme Court ruled that police generally need a search warrant to review cell phone records that include data like a user's location, which will impose a higher bar for law enforcement to access data collected on the millions of people who use smartphones on a daily basis. The plaintiff in the case, Timothy Carpenter, was convicted of multiple robbery and gun offenses in 2010 but challenged the conviction saying that officers investigating the case didn't get a warrant for his cell phone records. The government argued that law enforcement doesn't need a warrant to get cell phone records from the service provider since it's a third party. The Court ruled that the government's search, in this case, did not meet the bar for probable cause for a warrant. Chief Justice John Roberts wrote in the majority decision that the government is obligated to get a warrant before compelling a wireless provider to provide cell phone records in an investigation. We decline to grant the state unrestricted access to a wireless carrier's database of physical location information," Roberts said.