A federal judge has ruled that a Tulsa County sheriff’s deputy violated the Fourth Amendment when he used Flock license plate reader technology to access weeks of a driver’s travel history, warning that the system risks creating a nationwide “dragnet” of mass surveillance.

U.S. District Judge Sara E. Hill, a Biden appointee, ordered evidence obtained after the search suppressed, finding that the deputy’s use of automated license plate reader data, also known as ALPR data, was an unconstitutional search in violation of the Fourth Amendment.