Alpharetta, Georgia, cops share data with thousands of Flock users, ranging from federal agencies to a fish and wildlife commission. The reasons why show how vast—and invasive—the network has become.

After an affair with a fellow police officer ended, a Georgia cop used Flock to track her movements—and those of a man whose vehicle often showed up near hers, internal investigation records show.

A 31-year-old engineer and self-described indie game developer is suspected of firing shots at the annual event attended by President Donald Trump, high-profile media figures, and US government officials.