What Is a Breath Alcohol Technician? BAT Certification Explained

What is a Breath Alcohol Technician?

A Breath Alcohol Technician (BAT) is a person trained and qualified under 49 CFR Part 40 to conduct alcohol screening and confirmation tests on employees who are subject to DOT alcohol testing regulations, using an evidential breath testing device (EBT) or, for screening only, an alcohol screening device (ASD). The BAT's job is procedural, not medical: administer the test, follow the sequence in the regulation exactly, complete the Alcohol Testing Form correctly, and know how to handle an invalid test, a refusal, or a result that requires removing an employee from safety-sensitive duty. A BAT does not diagnose impairment or decide consequences — the employer and the regulation do that once a valid result is in hand.

What does 49 CFR §40.213 require of a BAT?

Section 40.213 sets the qualification bar. A BAT must complete a training course covering the fundamentals of alcohol testing, the DOT alcohol testing procedures in Part 40, use and operation of the specific EBT or ASD models the BAT will use, "problem" situations such as refusals and insufficient breath samples, and fatal and non-fatal flaws that can invalidate a test. Training must include a proficiency demonstration — the trainee has to run a minimum number of monitored practice tests on the actual device model before being considered qualified on it. Qualification is device-specific: a BAT trained on one EBT model is not automatically qualified on a different make or model without additional training on that device.

How is a BAT different from a DOT-certified inspector?

There is no such thing as a "DOT-certified" individual. The Department of Transportation writes and enforces the testing rules in Part 40, but it does not issue personal certifications to technicians, and it does not certify or endorse specific instruments. Instrument-specific training and any device qualification documentation come from the equipment manufacturer — for example, CMI Inc. trains and documents proficiency on its Intoxilyzer breath alcohol instruments. A BAT's credential is the training record and proficiency demonstration required by §40.213, kept on file and produced on request during a DOT audit, not a certificate issued by the government.

Role	What they do	Governing section
Breath Alcohol Technician (BAT)	Runs screening and confirmation breath tests on an EBT/ASD	49 CFR §40.213
Screening Test Technician (STT)	Runs screening tests only, on an ASD	49 CFR §40.211
Urine collector (for drug testing)	Collects specimens; separate qualification, not covered by BAT training	49 CFR §40.33

Who needs BAT training?

Any employer that runs its own DOT alcohol testing program in-house — rather than contracting every test out to a third-party clinic or collection site — needs at least one qualified BAT on staff or on call. That includes trucking companies, transit agencies, and any DOT-regulated employer with safety-sensitive positions who wants random and post-accident testing available without waiting on an outside vendor. Foster Special Instruments runs live BAT training at training.fosterinstruments.com covering the full §40.213 curriculum and hands-on proficiency testing on the instruments trainees will actually use.

How does Foster train and qualify a BAT?

A Foster BAT training session runs the §40.213 curriculum in person: the trainer walks through the Alcohol Testing Form field by field, then hands trainees the actual EBT model their site will use rather than a generic classroom unit, because qualification is device-specific and a training record on the wrong model doesn't hold up. Trainees run monitored practice tests — screening a subject, escalating to a confirmation, and working through a deliberately staged refusal and an insufficient-sample scenario — until the instructor signs off on proficiency for that device. Each trainee leaves with a dated training record naming the specific instrument model, which is the document an auditor or a defense attorney will ask to see first if a real test is ever challenged.

What do DOT auditors actually check about BAT qualification?

An auditor doesn't take an employer's word that its technicians are qualified — they ask for the training record itself: date, curriculum content, device model, and proof of the proficiency demonstration, then cross-check that record against the specific EBT or ASD serial number the employer has in service. A common finding is a BAT trained on one Intoxilyzer model years ago who's now running tests on a newer model the employer upgraded to without documenting supplemental training. Another is a training file with no proficiency sign-off, just a certificate of attendance — attendance alone doesn't satisfy §40.213's proficiency requirement. Employers should audit their own BAT files against current in-service equipment before a DOT auditor does it for them.

Frequently Asked Questions

Does a BAT certification expire?

Part 40 does not set a fixed expiration date for BAT qualification, but an employer should refresh training whenever there's reason to believe a BAT's performance is deficient, and whenever a new device model is introduced. Many employers build a periodic refresher into their program even though the regulation doesn't mandate a specific interval.

Can a BAT also collect drug test specimens?

Only if that person separately meets the urine collector qualification requirements in §40.33. BAT training under §40.213 does not qualify someone to collect specimens for drug testing.

What happens if a test is run by an unqualified BAT?

A test conducted by someone who does not meet §40.213 qualification requirements is a fatal flaw that can invalidate the result, which is why employers should retain training and proficiency records for every BAT on staff and produce them on request.

For the mechanics of what a BAT actually does at the point of testing, see how DOT screening and confirmation tests work step by step. For a program built around BAT staffing, calibration, and recordkeeping, see the program quote page or read about building a DOT breath alcohol testing program.