The Supreme Court is gradually coming to terms with the effect information technology is having on the Fourth Amendment. In 2001, the Kyllo court curtailed the use of high-tech devices for searching homes. In its early 2012 decision in United States v. Jones, a unanimous Court agreed that government agents can’t attach a GPS device to a vehicle and track it for four weeks without a warrant.
But the Court was divided as to rationale. The majority opinion in Jones found (consistent with Cato’s brief) that attaching the device to the car was at the heart of the Fourth Amendment violation. Four concurring members of the Court felt that the government’s tracking violated a “reasonable expectation of privacy.”
What is the right way to decide these cases? Fourth Amendment law is at a crossroads.
The next round of development in Fourth Amendment law may come in a pair of cases being argued in April. They ask whether government agents are entitled to search the cell phone of someone they’ve arrested merely because the phone has been properly seized. Riley v. California and Wurie v. United States have slightly different fact patterns, which should allow the fullest exposition of the issues.
Cato’s brief in Riley, filed this week, again seeks to guide the Court toward using time-tested principles in Fourth Amendment cases. Rather than vague pronouncements about privacy and people’s expectations around it, we invite the Court to apply the Fourth Amendment as a law.