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SESK: Stuff Everyone Should Know · sesk.info/cdl-bac-limit-004

What blood alcohol level is illegal for someone driving a commercial motor vehicle?

0.04 or higher, half the 0.08 limit most states set for car drivers.

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  1. 0.02 or higher
  2. 0.04 or higher ✔
  3. 0.08 or higher

Why: Driving a CMV with an alcohol concentration of 0.04 or more is illegal. A first conviction costs your CDL for at least one year.

Huh, didn't know that: Driving a CMV also counts as consent to an alcohol test.

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References

Answer: 0.04 or higher. Driving a CMV with an alcohol concentration of 0.04 or more is illegal. A first conviction costs your CDL for at least one year.

  1. California Commercial Driver Handbook (DMV) www.dmv.ca.gov/portal/file/california-commercial-driver-handbook-pdf
    It is illegal to operate a CMV if your BAC is .04 percent or more.
    Checked 2026-10-10.
  2. 49 CFR 382.201 Alcohol concentration (eCFR) www.ecfr.gov/current/title-49/section-382.201
    while having an alcohol concentration of 0.04 or greater
    Checked 2026-10-10.

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