Hundreds of Yorkshire convictions - potentially including murders and rapes - at risk over '˜data tampering' at lab

Two men were arrested earlier this year by Greater Manchester Police on suspicion of perverting the course of justice over allegations that some 484 cases - over 200 of which related to Yorkshire - handled by Randox Testing Services were affected by what the National Police Chiefs’ Council called “data manipulation” of toxicology results.

The original 484 cases largely related to drug-driving offences but a police probe has now revealed more than 6,000 toxicology samples, including for murder offences, could be at risk. It is not yet known how many of the new cases that have been uncovered relate to Yorkshire.

The Yorkshire Post revealed in March that Randox had provided toxicology services to all four of Yorkshire’s forces.

A team of forensic experts are identifying any live cases which require retesting and past cases where convictions could be unsafe, the National Police Chiefs’ Council (NPCC) said.

“The majority of cases affected are Road Traffic Act offences such as drug driving.

“However, RTS provided toxicology tests for other offences including rape, assault and murder so it is possible these cases could be affected,” a spokesman added.

Deputy Chief Constable James Vaughan, NPCC forensic expert, warned that the number of affected samples could change again as the investigation continues.

He said: “This is a serious breach of the very rigorous professional standards set by the Forensic Science Regulator for staff and organisations working in this critical field.

“We now have a clearer picture of the scale of this data manipulation and have been able to set out a plan of action in partnership with RTS, the Forensic Science Regulator and the CPS.

“The numbers affected could change as our investigations progress.