An accident is already a bad day. What your team does in the first few hours can make it better or worse. Post-accident testing has fixed deadlines, and missing them leaves gaps in your records.
This guide is for DERs, safety managers, and owners. It covers FMCSA-regulated motor carriers with CDL drivers, and employers who test under their own policy. Other DOT agencies set their own post-accident rules, so employers under those agencies should check their agency’s regulations.
Key Takeaways
- Medical care comes first. The testing rules do not require anyone to delay emergency care.
- Not every accident requires a DOT test. After a fatality, each surviving driver who was performing safety-sensitive functions with the vehicle must be tested. In a non-fatal accident, the driver must also receive a citation and be a certain level of severity.
- Ideally testing should happen within 2 hours. Stop alcohol attempts after 8 hours and drug attempts after 32 hours. Write down the reason for any delay.
- Non-DOT employers set their own rules in a written policy. A non-DOT test cannot be used as a DOT test.
- Write down times as events happen.
Which Accidents Require DOT Post-Accident Testing
Under 49 CFR Part 382.303, FMCSA requires post-accident drug and alcohol tests after certain accidents involving a commercial motor vehicle on a public road.
- A fatality. Each surviving driver who was performing safety-sensitive functions with the vehicle must be tested. No citation is needed.
- An injury. A driver who receives a citation for a moving traffic violation arising from the accident must be tested if someone is injured and gets medical treatment away from the scene right away.
- Disabling damage. A driver who receives that kind of citation must be tested if a vehicle is damaged so badly that it must be towed or otherwise carried away from the scene.
In injury and disabling-damage cases, law enforcement issues the citation, and the driver must receive it within 8 hours of the accident.
Your DER decides whether an accident meets these criteria. If you are not sure, ask your C/TPA before the deadlines pass. If an accident does not meet the criteria, you can still test under your company policy. That test is a non-DOT test and cannot be treated as a DOT test.
DOT Post-Accident Testing Deadlines
The deadlines in Part 382.303 run from the time of the accident.
- Alcohol: The test should be done within 2 hours. If it is not, the employer must write down why. If it is still not done after 8 hours, stop trying and keep a record of the reason.
- Drugs: The test should be done as soon as possible. If it is not done within 32 hours, stop trying and keep a record of the reason.
Alcohol is the more urgent test because its window is shorter. That said, they are almost always done in tandem: alcohol test first, drug test second.
What to Do in the First Hours
Step 1: Care for people first
Get medical help for anyone who needs it. A driver may leave the scene to get help or emergency care. The driver should tell the employer where to find them and stay available for testing. An employer may treat a driver who cannot be reached as having refused the test. That is the DER’s decision. Our guide to test refusals under DOT regulations explains how it works.
Step 2: Call the DER
Supervisors and drivers should call the DER as soon as it is safe. Share the time, the location, who was hurt, whether a citation was issued, and whether a vehicle was towed. Those facts decide whether a test is required.
Step 3: Arrange the collection
The DER contacts the C/TPA to set up the collections. If you do not yet know whether a citation will be issued, ask your C/TPA what to do while you wait. Deadlines run from the time of the accident.
Step 4: Remind the driver about alcohol
A driver who must take a post-accident alcohol test cannot use alcohol for 8 hours after the accident, or until the test is done, whichever comes first. Tell the driver this right away.
What to Document
The rule requires a written record of why a test was late or not done. The list below goes further. These items are good practice and make your file easier to defend.
- The time of the accident and the time the DER was told
- The facts used to decide whether the accident met the criteria, including any citation
- The time the collection was arranged and the time each test was done
- The reason for any delay, and the time you stopped trying if a deadline passed
- The result of each test
Write these down as events happen. Follow the record retention schedule in Part 382 and Part 40 for how long to keep them.
Post-Accident Testing for Non-DOT Employers
There is no federal deadline for a non-DOT post-accident test. Your written policy decides which incidents trigger a test, who makes that call, which tests you use, and what happens after a positive result. Apply it the same way each time.
Test as soon as you can. Waiting makes it harder to connect a result to the accident. Non-DOT programs can use urine, oral fluid, or breath alcohol tests. Oral fluid testing can be done on site without a restroom.
A post-accident test is not the same as a reasonable suspicion test. If a trained supervisor sees signs of impairment, that is a separate trigger. Our guide to reasonable suspicion testing explains how it works. Have legal counsel review your policy language before you rely on it.
After-Hours Collection and On-Site Testing
Accidents do not wait for business hours. PROCOM works with a network of collection sites, and testing can be authorized at those sites electronically. When no site fits the situation, PROCOM offers after-hours collections and on-site testing, bringing a collector to your location. PROCOM’s after-hours team is available 24/7 by direct phone to help the DER coordinate the response.
Ask your C/TPA how after-hours collection works before you need it. Keep the number where supervisors can find it.
What Happens With the Results
The MRO reviews drug test results, and the employer is told about a verified positive after that review. A verified positive drug result or an alcohol result of 0.04 or greater means the driver comes off safety-sensitive duty right away. For CDL drivers, the MRO reports verified positive drug results to the Clearinghouse, and the DER reports alcohol results of 0.04 or greater. Our guide on what a DER must do after a positive result covers each step.
Need Help With Post-Accident Testing?
PROCOM provides:
- 24/7 after-hours collection support
- On-site testing at your location
- Direct DER support, no ticketing system
- Clearinghouse support for FMCSA-regulated programs
- Audit-ready documentation
Build your post-accident plan before you need it.
📞 303-325-3010 | 📧 michelle@procomtesting.com
Frequently Asked Questions About Post-Accident Testing
No. For FMCSA-regulated carriers, a fatality requires testing each surviving driver who was performing safety-sensitive functions with the vehicle. In other accidents, the driver must receive a citation within 8 hours, and either someone must be treated away from the scene or a vehicle must be towed or otherwise carried away. If the accident does not meet these criteria, a test under company policy is a non-DOT test.
Yes. If there is no reasonable suspicion, the driver may resume safety-sensitive functions after the accident. The driver does not have to be on leave or inactive while the results are pending. If a verified positive result comes back, the driver comes off safety-sensitive duty right away.
Emergency care comes first. The driver should tell the employer where they are and stay available for testing. Depending on the circumstances, the hospital may provide occupational testing or they may allow a mobile collector to visit the hospital room. Test as soon as you can. If a deadline passes, stop trying when the rule says to and write down the reason.
Keep trying until 8 hours have passed, and write down why the test was late. After 8 hours, stop and keep a record of why the test was not done.
An accident triggers post-accident testing. A trained supervisor observing signs of impairment triggers reasonable suspicion testing. Both can apply to the same event, and each has its own rules.
Related Services: After-Hours Collections | On-Site Testing | DOT Drug and Alcohol Testing | Consortium and TPA Services | DER Support Services | View All Services
Related Content: Reasonable Suspicion Drug Testing | Test Refusals Under DOT Regulations | What a DER Must Do When a Drug Test Comes Back Positive | FMCSA Drug and Alcohol Audit Checklist
Compliance Resources: 49 CFR Part 382 | 49 CFR Part 40 | FMCSA Clearinghouse | FMCSA Drug and Alcohol Rules
Service Areas: Denver | Colorado Springs | Pueblo | Grand Junction | Glenwood Springs | View All Service Areas
Regulatory Disclaimer: This content is provided for general informational and educational purposes regarding FMCSA and DOT drug and alcohol testing requirements. It does not constitute legal advice, official FMCSA regulatory interpretation, or company-specific compliance guidance. Regulations under 49 CFR Part 382 and 49 CFR Part 40 are subject to amendment. Always verify you are applying current regulations and consult qualified legal counsel for definitive compliance requirements. PROCOM Testing provides DOT and non-DOT drug and alcohol testing
