DOT alcohol testing centers on two numbers. Knowing what 0.02 and 0.04 mean helps drivers and employers respond correctly.
The Two Limits
- 0.02 to 0.039: the driver must be removed from safety-sensitive duty for a set period (and cannot return until a retest is below 0.02), but it is not a violation requiring the return-to-duty process
- 0.04 and above: this is a DOT alcohol violation, and the driver must complete the return-to-duty process with a Substance Abuse Professional (SAP) before driving again
How BAT Works
A trained Breath Alcohol Technician (BAT) uses an approved device. A screening test at or above 0.02 is confirmed with a second test after a short waiting period, and the confirmation result is the official one.
Why It Matters
Acting on the wrong number can either sideline a driver unnecessarily or let a violation slip. The confirmation test is what counts.
Frequently Asked Questions
Is 0.02 a failed DOT alcohol test? It is not a violation, but the driver must be pulled from safety-sensitive duty until a later test reads below 0.02.
What happens at 0.04 or higher? That is a DOT alcohol violation. The driver must complete the SAP and return-to-duty process before driving again.
Does Test Pro provide BAT services? Yes, we provide breath alcohol testing with trained technicians.
Let Test Pro Handle It
Test Pro LLC in Kent, WA helps owner-operators, motor carriers and employers stay compliant across Washington and beyond — drug and alcohol testing, random pools, IFTA, filings and driver files. Call (206) 518-2097 or book an appointment. Questions first? Contact us.