No driver shall report for duty, remain on duty or perform a safety-sensitive function, if the driver tests positive or has adulterated or substituted a test specimen for controlled substances. No employer having knowledge that a driver has tested positive or has adulterated or substituted a test specimen for controlled substances shall permit the driver to perform or continue to perform safety-sensitive functions.
Reproduced verbatim from the electronic Code of Federal Regulations (eCFR), the official U.S. government source. X3 Fleet Safety LLC is a compliance-services company, not a law firm; this page is regulatory reference, not legal advice. X3 is not affiliated with FMCSA or USDOT.