WASHINGTON, Sept. 2 (TNSFR) -- The U.S. Department of Transportation is updating its testing procedures, which apply to millions of safety-sensitive workers, from commercial truck drivers and airline pilots to train engineers and mass transit operators. The addition of fentanyl to the drug-testing panel is a response to the growing presence of the substance in the U.S. and the associated risks to public well-being.

The proposal aims to harmonize testing standards with guidelines fro . . .

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