Post-accident drug and alcohol testing basics

What triggers a post-accident test

For DOT-regulated employers, each agency defines the accidents that require testing. For FMCSA-regulated employers, post-accident testing is required only when the accident and citation criteria in 49 CFR 382.303 are met. FTA, FRA, FAA, PHMSA and the Coast Guard each set their own post-accident criteria, so confirm which rule applies to your operation.

For non-DOT employers, your written policy defines the trigger, often an injury that needs medical treatment, significant property damage or a near miss. Write the trigger down before an incident happens. Deciding on the spot invites inconsistency and challenge.

The FMCSA time windows

For FMCSA-regulated employers, post-accident testing is required only when the accident and citation criteria in 49 CFR 382.303 are met. When it is required, the alcohol test is given as soon as practicable. If it is not completed within 2 hours, the employer documents the reason, and attempts continue up to 8 hours before stopping. Drug test attempts continue up to 32 hours.

Other DOT agencies set their own windows, so do not assume the FMCSA timing applies to every program. Non-DOT policies should set reasonable windows of their own.

Why alcohol is tested first

Alcohol leaves the body quickly. A breath test performed an hour after an incident means far more than one performed six hours later. When both tests are required, the breath alcohol test is done first, as soon as the collector arrives, and the drug test collection follows.

What to do in the first hour

• Take care of the people involved and the scene. Testing never comes before medical care.
• Note the time of the incident. Every window is measured from it.
• Do not let the employee drive to a clinic. That is one of the strongest reasons to bring the collector to the employee.
• Call dispatch at 1-800-539-4934. Tell us the program, the location and the time of the incident. Dispatch can start while details are still being gathered.
• Keep the employee in a safe place with a supervisor until the collector arrives.

If the employee went to the hospital

Call dispatch anyway. Depending on the program and the situation, the collector may meet the employee at an appropriate location after release. Do not assume the test is off the table.

Which methods are allowed

DOT drug testing under 49 CFR Part 40 uses authorized urine or oral-fluid specimens, documented on the Federal Custody and Control Form and tested through an HHS-certified laboratory. DOT alcohol screening may be performed using an approved breath or saliva screening device. A DOT confirmation test is performed by breath using an approved evidential breath testing device.

Instant drug tests, hair follicle testing and EtG are not permitted for DOT tests. Non-DOT programs may use an instant screen if the policy allows it. A non-negative instant screen should be sent for laboratory confirmation before it is treated as a confirmed positive. Employers should follow their written testing policy and applicable law when making employment decisions.

General education, not legal advice. Agency rules and your written policy control, and documenting every step matters.