Post-accident drug testing means testing employees after a workplace incident to find out whether drugs or alcohol played a part. Non-DOT employers aren't required by federal law to do it, but many choose to. If you do, it should follow a written policy, happen soon after the incident, and cover the people whose actions could have caused it, not only the person who got hurt.

What post-accident drug testing is (and when non-DOT employers use it)

A post-accident test (also called a post-incident test) happens after an event such as a forklift collision, a vehicle accident in a company truck, a fall from equipment, or a near miss that could have hurt someone. Its job is to answer one question: did drug or alcohol use contribute to what happened?

Employers in construction, manufacturing, warehousing, and logistics often use post-accident testing alongside pre-employment, random, and reasonable suspicion testing. The difference is the trigger. A reasonable suspicion test starts with what a supervisor sees, such as slurred speech or the smell of alcohol. A post-accident test starts with an event, even when nobody looked impaired.

Common reasons non-DOT employers test after incidents:

To find the root cause of an incident and stop it from happening again
To meet requirements in a workers' compensation program, insurance policy, or customer contract
To apply the same safety rules to everyone, every time

Writing the post-accident clause in your policy

Write your post-accident rules down before anything happens. Your policy should spell out:

What counts as an incident. For example: an injury that needs treatment beyond first aid, damage to equipment or property above a set amount, or a near miss involving a vehicle or heavy machinery.
Who gets tested. Any employee whose actions could have contributed to the incident, not just the person who reported an injury.
Who decides. Name the role (safety manager, site supervisor, HR) that decides whether a test is called for.
How soon the test happens. Set a target window and say what happens if testing can't be done in that window.
The test type and panel. Saliva, urine, or both, and which drugs you screen for.
What happens after a non-negative result. Lab confirmation, removal from safety-sensitive work while you wait, and who is allowed to see the results.
Refusals. Say whether refusing a post-accident test is treated the same as a positive result.

For more on the core parts of a policy, see the 5 most important clauses to include in a drug testing policy.

OSHA and post-accident testing: what to keep in mind

OSHA's injury reporting rule says employers "must not discharge or in any manner discriminate against any employee for reporting a work-related injury or illness" (29 CFR 1904.35(b)(1)(iv)). This anti-retaliation provision was added in 2016. Many employers worried that automatic testing after every reported injury could look like a penalty for reporting.

In an October 2018 memo, OSHA clarified that the rule does not prohibit post-incident drug testing. The memo says most workplace drug testing is allowed, including testing to find the root cause of an incident that harmed or could have harmed employees. It adds that if you test to investigate an incident, you should test every employee whose conduct could have contributed, not just the employees who reported injuries. Testing only becomes a problem when it's used to punish someone for reporting.

In practice, that means:

Test based on the incident, not on the fact that someone reported an injury.
Test everyone whose conduct could have contributed, including people who weren't hurt.
Avoid testing that has nothing to do with the likely cause. For example, testing someone for a bee sting or a repetitive strain injury could look like discouraging reports.
Apply your policy the same way every time, and document why each test was or wasn't ordered.

We cover OSHA's role in more depth in our post on OSHA drug and alcohol testing.

Check with your counsel and state law. Some states limit when and how employers can test, how they handle marijuana results, or tie testing to workers' compensation programs. This article is general information, not legal advice. Have an employment attorney review your policy before you roll it out.

Timing: why test soon after an incident

Drugs and alcohol leave the body over time, so a next-day test may not reflect what was in someone's system at the time of the incident. Testing promptly also helps tie the result to the event.

A few practical steps help you test quickly:

Take care of injuries first. Medical care always comes before testing.
Keep supplies on site. If the only option is driving an employee to an off-site clinic, you may lose hours. Having rapid kits at each location lets a trained staff member collect a sample right away.
Write down the times. Log when the incident happened, when the test was decided on, and when the sample was collected. If testing is delayed, note why.

Saliva or urine for post-accident tests?

Both work for post-accident testing. The right choice depends on what you need to know and where you're testing.

Saliva (mouth swab) drug tests are often a good fit after an incident because:

They're suited to detecting recent use, which is usually the question after an incident.
Collection happens in front of the collector, which makes tampering harder.
You don't need a restroom, so you can test on a job site, in a warehouse, or next to a vehicle.

Urine drug test cups are a common choice when:

You want a longer detection window that can show use in the days before the incident.
Your policy already uses urine for pre-employment and random testing, and you want to keep things consistent.
You have a private restroom available for collection. Our urine cups include temperature strips to help check that the sample is fresh.

Many employers stock both: saliva for the field, urine cups where there's a proper collection area. Either way, make sure the panel covers the drugs your policy lists.

Handling non-negative results: lab confirmation

A rapid test is a screen. When a result isn't negative, the next step is to send the sample to a lab for confirmation before you make a final employment decision. Lab confirmation identifies the specific substance and helps rule out results caused by legal medications.

A simple process for non-negative post-accident results:

Follow your policy on removing the employee from safety-sensitive work while you wait for the result.
Collect or send the specimen with a confirmation kit, following the kit's instructions and chain-of-custody steps.
Keep results confidential and limit access to the people who need them.
Make the final decision based on the confirmed result and your written policy.

DOT-covered employees: different rules

If an employee is covered by U.S. Department of Transportation rules (for example, commercial drivers under FMCSA), their post-accident testing follows federal rules, not just your company policy. DOT agencies define which accidents require testing and how quickly testing must be done, and DOT-required tests must go through a certified lab under 49 CFR Part 40. Rapid test kits can't be used for DOT-required tests.

If you have both DOT and non-DOT employees, keep the programs separate: DOT rules for covered employees, your company policy (with rapid kits, if you choose) for everyone else. If you need help with the DOT side, see our DOT compliance services.

Keep kits on hand at every site

Post-accident testing only works if supplies are there when something happens. A few habits help:

Stock every location. Each warehouse, plant, yard, or job trailer should have its own supply, not one shared box at headquarters.
Keep everything together. Store kits, gloves, forms, and confirmation kits in one place supervisors know about.
Check expiration dates. Use older kits first.
Train more than one person. Every shift should have someone who can run a test, in case the supervisor is involved or unavailable.
Set a reorder point. When a site gets down to a set number of kits, reorder before you run out.

Keep post-accident kits stocked at every location. Order from one box (25 tests), ship to multiple locations, and get net-30 terms after approval. Shop bulk drug tests for employers →

FAQ

Do non-DOT employers have to do post-accident drug testing?

Federal law doesn't require it for most non-DOT employers, but workers' comp programs, insurers, or contracts may expect it, and state laws vary. Check with your counsel.

Does OSHA allow post-accident drug testing?

Yes. OSHA's 2018 memo says the anti-retaliation rule doesn't prohibit post-incident drug testing. It's a problem only when testing is used to penalize someone for reporting an injury. Test to find the root cause, and test everyone whose conduct could have contributed.

Who should be tested after an accident?

Anyone whose actions could have contributed to the incident, as defined in your policy. That can include employees who weren't injured.

How soon after an accident should we test?

As soon as possible after injured employees get care. Set a target window in your policy, and document the reason if a test is delayed.

Is saliva or urine better after an accident?

Saliva tests are suited to recent use and can be collected on the spot under observation. Urine cups cover a longer window. Many employers keep both.

Can we use rapid kits for DOT post-accident tests?

No. DOT-required tests must be done through a certified lab under 49 CFR Part 40. Rapid kits are for your non-DOT testing program.

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Post-Accident Drug Testing: A Guide for Employers