BROOKFIELD — Brookfield residents and elected officials are raising questions about the city's use of Flock license plate reading cameras — technology police say helps fight crime but that some say raises serious privacy concerns. WATCH: Brookfield alderman weigh privacy concerns amid Flock camera debateBrookfield aldermen weigh privacy concerns amid Flock camera debateAlderman Peter Stoll said he shares some of those concerns. I also know that they can be a very useful tool for law enforcement," Stoll said. It's a two-year, $40,000 contract that shows there are seven Flock cameras in the city. The company also said that in July alone, Flock cameras in Wisconsin alerted authorities to 16 missing people and more than 200 sex offenders.