The Macomb County Sheriff's Office has added a new investigative staff to its team.The Office recently launched a new Unmanned Aerial Vehicle (UAV) Unit. These vehicles, more commonly known as drones, are an additional resource that can aid current investigative techniques and personnel.The UAV unit can be activated when searching for a missing person, performing a rescue, encountering a barricaded gunman or hostage situation, and conducting traffic crash and crime scene investigations.