Holiday Season Reminder: DOT Alcohol Rules Reach Four Hours Before a Driver Clocks In
Holiday parties and year-end events are starting, and the DOT alcohol prohibitions in 49 CFR Part 382 reach further than many drivers expect. None of these rules has changed; the chance of running into them rises this time of year.
- Four-hour rule: under 49 CFR 382.207, no driver may perform safety-sensitive functions within four hours after using alcohol.
- Under 49 CFR 382.201, a driver with an alcohol concentration of 0.04 or greater may not report for or remain on safety-sensitive duty.
- A confirmation result of 0.02 to 0.039 is not a return-to-duty violation, but 49 CFR 382.505 keeps the driver off safety-sensitive functions until the start of the next regularly scheduled duty period, and never less than 24 hours.
- An employer with actual knowledge of a four-hour violation must keep the driver out of a CMV until the Part 40 return-to-duty process is complete (49 CFR 382.217).
What it means: Remind drivers and supervisors of the four-hour window before holiday events, and be ready to pull a driver from safety-sensitive duty on a 0.02 result even though it is not a testing violation.
Source: eCFR: 49 CFR 382.207 - Pre-duty use
Official reference: eCFR: 49 CFR 382.505 - Other alcohol-related conduct