This one can be complicated.
If the employee is not presently working and available to perform safety-sensitive functions, he should not go for testing at this time. Document the reason and select an alternate.
If the individual is driving, or available to drive, did the prescribing physician know that he drives for a living? The doctor may decide he shouldn’t drive while on the pain medication or may be able to prescribe something different that won’t affect his driving.
Should the result come back positive, the MRO would call him and discuss the result and the driver would would be asked to produce the prescription which the MRO will verify. If the prescription is valid, the result will be reported as negative. BUT, the MRO may attach a safety concern.