The FBI has confirmed it is buying location data to track US citizens, with the agency's director stating that it uses all tools available to fulfill its mission. This practice involves purchasing data from brokers who collect information from consumer phone apps and games. The FBI claims it does not need a warrant to use this information for federal investigations, but lawmakers have introduced a bill to require a court-authorized warrant before federal agencies can buy Americans' information from data brokers. The practice has raised concerns about mass surveillance and the potential for abuse of power.