A reader writes with an excerpt from Wired with some (state-specific, but encouraging) news about how much latitude police are given to track you based on signals like wireless transmissions.
The Florida Supreme Court ruled Thursday that obtaining cell phone location data to track a person's location or movement in real time constitutes a Fourth Amendment search and therefore requires a court-ordered warrant.
The case specifically involves cell tower data for a convicted drug dealer that police obtained from a telecom without a warrant. But the way the ruling is written (.pdf), it would also cover the use of so-called "stingrays" — sophisticated technology law enforcement agencies use to locate and track people in the field without assistance from telecoms. Agencies around the country, including in Florida, have been using the technology to track suspects — sometimes without obtaining a court order, other times deliberately deceiving judges and defendants about their use of the devices to track suspects, telling judges the information came from "confidential" sources rather than disclose their use of stingrays. The new ruling would require them to obtain a warrant or stop using the devices. The American Civil Liberties Union calls the Florida ruling "a resounding defense" of the public's right to privacy.
