Federal Court Says Warrants Are Needed For Stingray Deployment

Techdirt:

The DOJ — despite issuing its own guidance requiring warrants for Stingrays in 2015 — argued in court earlier this year that no warrant was needed to deploy the Stingray to locate a shooting suspect. It actually recommended the court not reach a conclusion on the Fourth Amendment implications of Stingray use, as it had plenty of warrant exceptions at the ready — mainly the “exigent circumstances” of locating a suspect wanted for a violent crime.
Unfortunately for the federal government (and all other law enforcement agencies located in the court’s jurisdiction), the court declined the DOJ’s offer to look the other way on Constitutional issues. It found a Stingray’s impersonation of cell tower to obtain real-time location information is a search under the Fourth Amendment.

The court adopts Judge Koh’s reasoning in In re Application for Telephone Information, 119 F. Supp. 3d at 1026, to hold that cell phone users have an expectation of privacy in their cell phone location in real time and that society is prepared to recognize that expectation as reasonable. While Judge Koh limited her analysis to the privacy interest in historical CSLI, the court determines that cell phone users have an even stronger privacy interest in real time location information associated with their cell phones, which act as a close proxy to one’s actual physical location because most cell phone users keep their phones on their person or within reach, as the Supreme Court recognized in Riley. In light of the persuasive authority of Lambis, and the reasoning of my learned colleagues on this court recognizing a privacy interest in historical cell site location information, the court holds that Ellis had a reasonable expectation of privacy in his real-time cell phone location, and that use of the Stingray devices to locate his cell phone amounted to a search requiring a warrant, absent an exception to the warrant requirement.