Stingray Technology Must Answer to the Fourth Amendment The federal judiciary is beginning to catch up with how far and how fast technology is taking us from the Constitution and its guarantees of our civil rights. In June, the U.S. Supreme Court held in Chatrie v. United States that the government conducts a Fourth Amendment search when it obtains a target’s cellphone location history through a geofence warrant. More recently, a federal judge in Oklahoma found that a deputy sheriff’s warrantless search of historical location information collected through Flock Safety’s automated license-plate reader network was unconstitutional. And little more than a week ago, the U.S. Court of Appeals for the Fourth Circuit held that police use of a cell-site simulator to pinpoint a cellphone’s location constitutes a Fourth Amendment search subject to the warrant requirement. Make no mistake, this is a landmark decision that marks the first time a federal appeals court has squarely resolved that question. Cell-site simulators are devices that impersonate cellphone towers, tricking nearby cellphones into transmitting identifying signals. These devices, often called “stingrays” after one brand of simulators, allow police to pinpoint the location of cellphones. PPSA has long warned that stingrays reach beyond a targeted suspect, sweeping in nearby devices and raising serious concerns about surveillance of peaceful protesters. FBI nondisclosure agreements have also helped conceal their use from defendants and courts. The case decided by the Fourth Circuit concerns Baltimore police officers who used a simulator called Hailstorm in 2014 to locate Kerron Andrews – suspected of attempted murder – inside a particular townhouse. Information from his cellphone provider had narrowed his location to several blocks. The simulator took officers to his front door. Its use remained undisclosed to his counsel for a year. Judge Nicole Berner, writing for the majority joined by Judge Toby Heytens, explained: “This technology is akin to sense-enhancing technology that allows the government to peer into a private home, which the Supreme Court has repeatedly held requires a warrant.” The Fourth Circuit followed the logic of Kyllo v. United States (2001), in which the Supreme Court ruled that police use of thermal-imaging technology to detect heat emanating from a home constituted a Fourth Amendment search. The opinion in Andrews v. Baltimore City Police Department found that using a cell-site simulator to locate Andrews inside a home was similarly invasive. It didn’t help the government’s case that the police tried to abide by their NDA with the FBI by hiding their use of the cell-site simulator behind a warrant application for a different kind of surveillance, called a pen register/trap and trace device. The Fourth Circuit underscored the importance of its opinion: “Despite the ubiquity of cell-site simulators, no federal court of appeals has squarely addressed whether law enforcement’s use of this technology for real-time tracking of a cellphone constitutes a search for purposes of the Fourth Amendment. Today, we hold that it does.” This was not a personal victory for Andrews. Despite having spent two years in pretrial detention, Andrews’s civil suit against the police department and detectives cannot proceed. The Fourth Circuit ruled that because the constitutional issue was not clearly established in 2014, the police are entitled to qualified immunity. The majority did not decide whether the existing court order, which initially narrowed the search to a few blocks, satisfied the constitutional warrant requirement. This case is another sign that courts are sharpening constitutional boundaries. Police cannot evade the protections surrounding a home by electronically reaching inside it. And Americans should not have to choose between carrying a cellphone and enjoying their privacy. PPSA applauds this ruling. The next step must be meaningful accountability and full disclosure when stingrays are used. A secret surveillance tool must never become a secret exception to the Fourth Amendment. Chatrie v. United States |
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