There is evidence to suggest that Detective Sergeant John Davidson acted corruptly during the murder investigation of teenager Stephen Lawrence, the Ellison review has found.
Mark Ellison QC said there was a high level of suspicion that the former officer was corrupt both before and after he worked on the police investigation.
The Ellison report said that in July 1998, Scotland Yard's Anti-Corruption Command heard claims made against Mr Davidson, but they were not shared or revealed by the public inquiry into police racism led by Sir William Macpherson in the wake of Lawrence's murder.
Mr Ellison said that, while independent corroboration of some of the allegations did not currently exist, there were "outstanding lines of inquiry" that could be investigated, which may change that assessment. He added:
"It is not impossible to envisage that the inquiry might have been driven to the conclusion that there must have been more to John Davidson's failure to develop information and evidence in the Lawrence investigation than simply an inappropriate manner and unfortunate unconscious racism".
A senior Met Police officer has been moved from his role following the publication of a report into Stephen Lawrence's murder investigation.
Almost 21 years after Stephen Lawrence was stabbed to death, the Home Secretary has ordered a public inquiry into undercover policing .