Legal Resources | Code of Federal Regulations, Title 49 | 382.201, 382.201
Subpart B--Prohibitions. Alcohol concentration.
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 actual 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.