Choosing a Breath Alcohol Testing Device: What You Need to Know

Key Points:

• Over 100 NHTSA-approved devices exist
• DOT testing requires devices listed on the appropriate NHTSA Conforming Products List
• Screening tests and evidential (confirmation) tests have different requirements
• Many devices cannot be used for full DOT testing
• Key considerations include cost, sensor type, portability, features, training needs, and consumable expenses
• Fuel-cell devices are the standard for DOT-compliant accuracy
• Automatic breath sampling improves test reliability
• Always confirm availability and cost of DOT-compliant BAT training for your chosen device

Choosing the right breath alcohol testing equipment is an essential decision for any organization that performs DOT or workplace alcohol testing. With more than 100 devices listed on the National Highway Traffic Safety Administration (NHTSA) Conforming Products Lists, the selection process can become confusing—especially when different devices have varying capabilities, limitations, and DOT compliance requirements.

This guide simplifies the process by breaking down the key factors you should consider when selecting a breath alcohol testing instrument that fits your operational needs and budget.

Is the Device NHTSA-Approved?

When performing any DOT-regulated testing, the device must appear on the NHTSA conforming products list (CPL). There are two lists to be aware of:

• Conforming Products List of Alcohol Screening Devices
• Conforming Products List of Evidential Breath Measurement Devices

Important distinctions:

• Devices on the screening list can be used only for initial screening tests
• Devices on the evidential list can generally be used for both screening and confirmation tests
• Some evidential devices are marked with an asterisk, meaning they can only be used for screening
• A few devices on the evidential list still do not meet all DOT requirements (e.g., inability to print results)

Always verify with the manufacturer or an authorized distributor that the device meets full DOT requirements for both screening and confirmation tests.

Screening vs. Evidential Tests: What’s the Difference?

DOT breath alcohol testing involves two steps:

Screening Test

• Provides the initial result
• If the result is below 0.02%, the test is complete
• Cannot be used for legal or disciplinary purposes

Confirmation (Evidential) Test

• Required if the screening result is 0.02% or higher
• Must be conducted on an evidential device
• Can be used as evidence in legal or disciplinary action

If you offer DOT breath alcohol testing, you must be able to conduct both tests.

While you can use two separate devices, most providers save money by choosing one device capable of both screening and evidential testing.

Is the Cost Worth the Benefit?

Breath alcohol devices range widely in price. Before choosing the cheapest option, consider:

• Higher-priced units often include features that improve reliability and usability
• Some low-cost devices have higher consumable costs
• Devices with better sensors (fuel cells) are more accurate and required for DOT testing

Think long term: accuracy, durability, maintenance, and consumables may affect your total cost more than the initial price tag.

Key Features to Consider

Different organizations have different operational needs. When evaluating devices, think carefully about which features matter to you.

Portability

• Portable units: good for mobile testing or onsite programs
• Desktop units: ideal for fixed testing locations

Printing Capabilities

DOT rules require printed results. Confirm whether the device can:

• Print directly from the unit
• Print past test results
• Connect to a printer or thermal printer

Sensor Type

Breath alcohol devices use one of two sensor technologies:

Fuel Cell Sensors

• Highly accurate
• Alcohol-specific
• Required for evidential and DOT testing
• Standard for professional-grade devices

Semiconductor Sensors

• Less accurate
• Can detect substances other than alcohol
• Not used in any NHTSA-approved evidential devices

For DOT compliance, fuel-cell devices are the clear choice.

Automatic Breath Sampling

High-quality devices use automatic breath sampling, which:

• Detects breath flow
• Collects air only from the deep lung (alveolar) portion
• Ensures the most accurate reading
• Reduces operator error

Calibration & Accuracy Checks

Choose a device that:

• Alerts you when calibration is required
• Allows the operator to calibrate the device
• Supports easy accuracy checks (important for contested results)

Consumables: The Hidden Ongoing Cost

Consumable items may include:

• Mouthpieces
• Gas tanks (for calibration)
• Testing forms
• Printer paper

Some low-cost devices require high-cost consumables, which may significantly increase long-term expenses.

Training Requirements

DOT requires Breath Alcohol Technician (BAT) training on the specific device and model you will use. Before selecting a device:

• Confirm that DOT-compliant training is available
• Verify training costs
• Ensure training is offered within a reasonable distance or online

Conclusion

Selecting the right breath alcohol testing device requires balancing cost, compliance, features, and long-term operational needs. By understanding the differences between screening and evidential tests, verifying NHTSA approval, and considering key features such as sensor type, portability, training availability, and consumable costs, you can confidently choose a device that meets DOT requirements and supports reliable, professional-grade testing.

With a clear sense of your priorities and budget, navigating the long list of available devices becomes much easier and ensures your organization is equipped for accurate, compliant alcohol testing.

Medical Review & Authorship

Written by: Dr. Jeffrey Carlson – Chief Medical Officer
Dr. Carlson leads TeamCME’s medical training programs and publishes regularly on DOT medical compliance and examiner best practices.

Reviewed by: Dr. Michael Megehee, DC, NRCME – Founder & Senior Advisor
FMCSA subject matter expert selected to help design the original NRCME educational curriculum and first exam questions.