The uproar following the acquittal of Police Sergeant Martyn Blake over the death of Chris Kaba exposes a deep unease with the police complaints process. Even without knowing about Kaba’s past criminal record, the jury spent barely three hours before acquitting Blake. Yet last night’s BBC Panorama documentary suggests that those in the Independent Office for Police Conduct (IOPC) – who took the original decision to refer the case to the Crown Prosecution Service (CPS) – remain convinced they were right to do so.