If you’re listening to this while driving, there’s a chance you’ve passed an automated license plate reader, or ALPR. Those are cameras mounted on police vehicles or streetlights that scan license plates and feed that information into databases. But with more surveillance comes larger questions about who should be using this technology and for what purpose. Marketplace’s Kimberly Adams speaks with Rachel Levinson-Waldman, managing director of the Liberty & National Security program at the Brennan Center for Justice.