Crumlin-based company, Randox, is facing negative publicity.
It's after two workers at their police drug testing lab in Manchester were arrested.
The men face suspicion of perverting the course of justice, and have now been bailed.
Meanwhile hundreds of cases at Randox Testing Services could be reviewed.
But at this stage, the PSNI say there's no reason to believe that any of the cases relate to them.
Jury sworn in for Noah Donohoe inquest
Sharing of explicit AI images in Armagh school being investigated by police
Long-awaited inquest into death of Belfast schoolboy Noah Donohoe due to start
Murder investigation launched following death of man in Coleraine
Man arrested over threats to elected representatives