These cameras may have been originally sold to municipalities as a way to find stolen cars, but from one year to the next, federal agencies have (1) decided that their main goal is finding arbitrary noncitizens to deport, and (2) that they're entitled to the ALPR data collected by municipalities in order to accomplish this goal. The technology isn't any different, but as a result of the way it was deployed (on Flock's centralized platform), it was trivial to flip a switch and turn it into a mass surveillance network.