49 CFR §382.201
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
No driver shall report for duty or remain on duty requiring the performance of safety-sensitive functions while having an alcohol concentration of 0.04 or greater. No employer having knowledge that a driver has an alcohol concentration of 0.04 or greater shall permit the driver to perform or continue to perform safety-sensitive functions.