Bosses at Randox Testing Services believe there are as many as 484 suspected cases of manipulation at its Manchester Office.
Two workers from the lab are currently on police bail having been suspected of alleged tampering at a lab used by more than half of UK Police Forces.
The Crown Prosecution Service (CPS)Â will now review dozens of cases.
A CPS spokesperson said 'We are working with the Home Office, police and the Office of the Forensic Science Regulator to assess the impact of the testing failure at Randox Testing Services.
Greater Manchester Police have confirmed that they have been asked to conduct a Criminal Investigation into forensic results issued by Randox Testing Services.
If you have any  concerns following  the launch of this investigation,  please  call Garratts Criminal Law Solicitors on 0161 344 2244 or on our 24hr Emergency line on 07971 163241.
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