Cars drive by a Flock Camera, an automated license plate reader. Most of the searches were run on Fridley's Flock Safety cameras, as Fridley had looser restrictions on its data than other agencies. In St. Petersburg, Fla., Carl Gunn has been obscuring a camera's view with a sign atop a 14-foot-tall pole that reads, "Down with Flock cameras." If there are Flock cameras in your city, they are tracking, logging and sharing your movements without a warrant." Allison Kite and Sarah Ritter of the Minnesota Star Tribune contributed to this story.