Automated license-plate readers are spreading across Bexar County, giving police a powerful investigative tool while prompting concerns about mass surveillance, civil rights and documented misuse. The Bexar County Sheriff’s Office operates 33 cameras. But Savannah Kumar, a staff attorney with the ACLU of Texas, told TPR’s The Source that the cameras collect information about everyone, not only suspects. “The Supreme Court has said that people have a reasonable expectation of privacy in their physical movements,” Soyfer said. Bexar County says searches must be connected to criminal investigations and vehicle data is deleted after 30 days.