HUNDREDS of drug-driver cases are under review including a number of toxicology tests in Cheshire after a police probe was launched into the actions of staff at a forensics lab used by forces.

An investigation is under way after two men who work at a Randox Testing Services (RTS) used by Cheshire Constabulary to test drug samples were arrested.

The men, 47 and 31, were arrested on suspicion of perverting the course of justice.

The two suspects have been bailed until next month as investigations continue into tests carried out at RTS.

A spokesman for Cheshire Constabulary said: "Cheshire Police is aware of a criminal investigation into forensic results issued by RTS and is currently reviewing a number of cases affected in Cheshire and will comply in accordance with NPCC guidance."

Cheshire Police is not the only force in the country to be reviewing cases as RTS has provided forensic services to a number of police forces.

This includes Greater Manchester Police who are currently carrying out the criminal investigation into forensic results issued from the company's office in Manchester.

In a statement published on the RTS website a spokesman said: “A number of toxicology results, which are part of due legal process, have been compromised.  

"RTS are working tirelessly to fully assess the impact and implications for each case.

“Where possible, when viable, samples will be re-run to provide robust, uncompromised results.”

He added: "There is no question mark over the RTS quality system or the robustness of our practices and procedures."

It is believed almost 500 cases could be reviewed across the country as a result of the investigation.

This is over allegations that 484 cases handled by RTS were allegedly affected by 'data manipulation' according to the National Police Chiefs' Council.

The investigation has raised concerns that hundreds of people could have been the victims of miscarriages of justice because of convictions based on incorrect test results in their cases.