Fourth Amendment, GPS, Law & order, location data, Privacy, Supreme Court US authorities now need warrant for your cellphone location data dev_threatravens June 27, 2018 Privacy activists scored a legal victory this week after the Supreme Court ruled it unlawful for law enforcement and federal agencies to access cellphone location records without a warrant. Share this:Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on WhatsApp (Opens in new window)