As a criminologist, he has made more than 30 films on police and criminal justice issues, including "Police", "Operation Carter", "In Search of Law and Order UK" (Channel 4) and "In Search of Law and Order - USA" (PBS and Channel 4) on positive ways to address youth offending, which influenced the National Youth Justice Board. "Police 2001" (BBC) looked at how policing had changed since his 1982 series, and "Panorama: Rape on Trial" looked at how much had changed in the handling of rape since his 1982 film. His 1987 fiction film "Closing Ranks" (ITV/Zenith) about domestic violence in the police was used in training for many years. Since 1995 he has been a Visiting Fellow and then Visiting Professor at the Mannheim Centre for Criminology at the London School of Economics. Since 2001, he has been a member of the Independent Advisory Group in Race for the Metropolitan Police. He has made many films on race and policing, including "Murder Blues", three films following Operation Trident on black on black gun crime for the BBC. For Channel Four he made "Race Against Crime", and "The Siege of Scotland Yard" around the run-up and publication of the Macpherson Report into the murder of Stephen Lawrence (2000). For Channel Four Dispatches, he made "Not Black and White" on black v Asian conflicts. And "Ready for A Riot" on Met training for public order disturbances following the riots around the G20 summit in London. He also made "Searching for Madeleine" (2007) on the mistakes of the original investigation into the disappearance of Madeleine McCann in Portugal.