There's been a significant increase in the number of Irish companies drug testing their employees.
A Northern Irish lab has said its traditional customer base of US or multi-national companies has evolved, with a number of indigenous firms now seeking their assistance.
Scientists examine blood, saliva and urine samples given by workers when they are testing for traces of drugs or alcohol.
Experts say a drug is detectable in urine for four days, or in the case of cannabis much longer. Saliva tests will only work for a couple of days, but if it's done quickly it will provide quick results. Hair sample tends to be used before a person is given a job.
Gary mcCutchinsons from Randox Laboratories spoke to Newstalk's Breakfast this morning - he argued that managers are just trying to provide safe environments for their workers:
