CHARLOTTESVILLE, Va., Nov. 2 -- The University of Virginia issued the following news release:

Automatic license plate readers are popping up across the country, and so are concerns about mass surveillance.

Charlottesville City Council terminated its contract with one operator after a one-year pilot with 10 devices, and at least 20 Virginia localities have stopped using Flock Safety cameras since July. Supporters point to the technology's value to law enforcement, while critics question whether privacy protections have kept pace with the technology's rapid deployment.

Daniel Graham, an associate professor at the University of Virginia School of Data Science and a cybersecurity expert, teaches students the art of "ethical hacking" - findin...