Breath alcohol screening for employers built on a sound program

Testing without a policy invites disputes. Before the first breath sample, put the rules in writing and make sure every employee receives them and acknowledges them.

• Who is covered, and whether testing applies to all staff or to specific safety sensitive roles.
• When testing happens, such as pre employment, reasonable suspicion, post accident, random or return to duty.
• What alcohol level triggers action, and what that action is.
• Who conducts tests, and what training they have.
• How results are kept confidential and who can see them.
• What support is available, such as an employee assistance program, and how a return to work is handled.

State law shapes much of this. Some states limit random testing outside regulated industries, require specific notice periods or set rules on how results may be used. Union agreements can add further terms. Check current state requirements before you finalize the policy.

The biggest dividing line is whether the employees fall under federal Department of Transportation rules. DOT regulated employers, such as motor carriers under FMCSA, aviation, rail, transit, pipeline and maritime operators, must follow 49 CFR Part 40 and the rules of their specific agency. Those regulations dictate who is tested, when, with which devices and by whom, and they leave little room for local variation.

Under the DOT framework, a breath result of 0.04 or higher is a violation that removes the employee from safety sensitive duties until a return to duty process is complete. A result from 0.02 up to below 0.04 is not a violation, but agency rules generally require the employee to be removed from safety sensitive work for a set period. Our dot breath alcohol testing guide explains these procedures in more depth.

Non DOT programs are designed by the employer within the limits of state law. Many borrow the DOT structure because it is well understood and defensible, yet they are free to set their own thresholds, testing occasions and consequences. What they must not do is mix the two: DOT tests have to follow DOT rules exactly, and a non DOT test should never be presented as a federal test.

This is an estimate. It cannot tell you whether you are safe or legal to drive. If you have been drinking, do not drive.

Workplace alcohol testing is usually a two step process, and mixing the steps up is a common source of trouble.

A screening test is the first check. Its job is to separate negative results quickly from results that need a closer look. Under DOT rules, screening can be done with an approved alcohol screening device or an evidential breath tester, and a result below 0.02 ends the test as negative.

A confirmation test is required whenever the screening result reaches 0.02 or higher. It must be performed on an evidential breath tester by a trained breath alcohol technician, after a waiting period of at least 15 minutes during which the employee does not eat, drink, smoke or put anything in the mouth. The confirmation result, not the screening result, is the one that counts.

Non DOT programs often follow the same logic. A positive screen on a handheld device should lead to a confirmation on better equipment before any serious employment decision is made.

Devices for workplace use fall into a few broad classes, and the right choice depends on whether the program is regulated.

• Evidential breath testers produce results that can support confirmation tests and legal or disciplinary decisions. DOT programs must use models on the NHTSA Conforming Products List for evidential devices.
• Approved screening devices, also listed by NHTSA, are acceptable for DOT screening tests but not for confirmation.
• Professional grade fuel cell handhelds are common in non DOT programs for quick screening, with a confirmation step on evidential equipment when a result is positive.
• Wall mounted or kiosk style units suit sites where many workers check in each shift, often as voluntary self tests.

Consumer semiconductor testers are not suitable for workplace decisions. Their readings shift with other substances and drift faster, which makes them hard to defend. You can compare commercial options on our professional breathalyzer page, and the wall mounted breathalyzer page covers fixed units.

Whatever you choose, follow the maker's calibration schedule and keep calibration certificates on file. A test from an out of date device is easy to challenge.

Equipment is only half of a defensible test. The person running it needs proper training. In DOT programs that means a screening test technician for screening devices and a breath alcohol technician for evidential testers, each trained and proficient on the specific device. In non DOT programs, training should still cover device operation, the waiting period, observation, privacy, how to handle refusals and how to complete paperwork.

Testing should happen in a private setting, with the employee's identity confirmed and the result shown to them. A technician who skips the waiting period or rushes a sample creates a result that may not hold up.

Good records protect both the employer and the employee. At a minimum, keep the test form, the device used, its calibration status, the technician, the time of each test and the result. DOT rules set specific retention periods by record type, with records of results of 0.02 and above kept longer than negative results, and they restrict who can access the files. Non DOT employers should set their own retention rules in the policy and store records separately from general personnel files.

• Keep testing records confidential and access limited to people who need them.
• Store calibration and maintenance logs for every device.
• Document training for every person who conducts tests.
• Record refusals and incomplete tests as carefully as completed ones.

A sound breath alcohol program reads as fair to employees and holds up when challenged. Write the policy first, decide whether DOT rules apply, separate screening from confirmation, buy equipment that fits the role, train the people who use it and keep careful records. For official detail, the DOT Office of Drug and Alcohol Policy and Compliance publishes the full text of 49 CFR Part 40 and related guidance.