The SEC’s Stock Surveillance and the Fourth Amendment

In this episode of Unwritten Law, Mark Chenoweth and John Vecchione are joined by NCLA Of Counsel Margot Cleveland to discuss one of NCLA’s most consequential ongoing cases: Davidson v. Adkins, a constitutional challenge to the SEC’s Consolidated Audit Trail (CAT).The CAT requires broker-dealers to collect and transmit detailed data on virtually every stock trade in the United States, creating a massive government-accessible database of Americans’ financial activity. Margot explains why recent changes announced by the SEC—such as removing names but retaining identifying numbers—do not cure the Fourth Amendment problem, and why suspicionless, warrantless searches of stock-trading data resemble the general warrants the Constitution was designed to forbid.The episode also examines the SEC’s repeated requests for delays while the program continues to operate, the lack of congressional authorization or appropriation for CAT, related rulings from the Eleventh Circuit, and the broader dangers of mass financial surveillance for privacy, free association, and constitutional limits on agency power.