Local officials said the cameras have helped close more than 60 cases. But opponents of the technology say it can be used for mass surveillance, since the system is linked to a nationwide network.

Sandy Boyce, a 72-year-old retiree in Sedona, Arizona, first saw the cameras around town this summer. They were black and sleek, mounted on tall poles under large solar panels and positioned at ...

Forbes contributors publish independent expert analyses and insights. Technology journalist specializing in audio, computing and Apple Macs. Surveillance cameras with license plate recognition were ...