More than 230 cops have left Louisville Metro Police Department since 2020
Departures come amid sharp spike in violent crime in the Kentucky city
Murders have risen by 75 per cent, while non-fatal shootings have gone up by 84 per cent
Department has been in turmoil since March 2020 killing of Breonna Taylor
Taylor, 26, fatally shot by cops executing no-knock search warrant at her home
Department of Justice announced it was reviewing policing in Louisville