The police force which is already under scrutiny for doctoring evidence after the Hillsborough disaster is accused of a similar cover-up after another controversial moment of recent history.
An MP has called for an inquiry into the similarities in nearly one hundred statements taken by the South Yorkshire force after the worst confrontation of the miners' strike.
A BBC documentary features allegations that some police involved in prosecutions following the infamous violence at the Orgreave coking plant colluded when they wrote their statements.
The Inside Out programme has obtained copies of around 100 police witness statements which programme makers say show the extent to which officers used identical phrases.
Our Correspondent Geraint Vincent examines the claims.