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A city of Boston surveillance report revealed new concerns about the city's pilot program with Flock Safety last year.

Flock produces a nationwide network of cameras known as automated license plate readers.

In the Boston pilot, Flock was supposed to limit the data it collected to a small number of local police officers.

Instead, the company made it widely available at the outset to other law enforcement agencies.

Larry Calderon, president of the Boston Police Patrolmen's Union, told us he's not surprised, but it's troubling.

Any company that's gathering data on citizens around the country should be questioned and watched.

I mean, when is over surveillance too much?

Flock didn't respond to a request for comment.

There's a special level of scrutiny on this company because of its massive network.

The tech basically could allow someone to piece together a car's movement across the country.

Police say the cameras make it easier to catch dangerous suspects and respond to amber alerts.

Critics call license plate readers surveillance on steroids.

Boston police say they won't use Flock cameras moving forward, but they have launched more recent pilots with competitors.