Does my driver need a post-accident drug and alcohol test?

Chapter 01

Which crashes need a post-accident drug and alcohol test?

Post-accident testing is required in two cases. If anyone died, you test your driver every time. If nobody died, you test only if your driver got a ticket for a moving violation. The crash must also have sent someone for treatment away from the scene, or left a vehicle towed away with damage. For the alcohol test, the ticket must come within 8 hours of the crash. For the drug test, within 32 hours (the testing rule). Whether your driver needs a drug test after an accident depends on these facts.

Here is how that looks in real life. Say you run three trucks. On Tuesday, October 13, 2026, at 11:05 p.m., your phone rings. One of your drivers is on an interstate two States from home. At 10:50 p.m., while he was changing lanes, his trailer clipped a car. The car hit the guardrail. Its driver has a deep cut on her arm, and an ambulance is taking her to the hospital. A tow truck is loading her car. Your truck has a scraped trailer and can still drive. All the times in this story are the driver’s local time.

He called you first because of the card in his cab. It has your number, your testing company’s number and what to do after a crash. The rules make you give drivers those instructions before they drive (the testing rule). Your written testing policy must include them too (the policy rule). Our guide to running a DOT testing program explains that policy.

The rule you are working under is called post-accident testing. It starts from the federal meaning of a crash (the federal definition). A crash of your truck on a public road counts if someone dies. It counts if someone is hurt and “immediately receives medical treatment away from the scene”. And it counts if a vehicle has “disabling damage” and must be towed away. That means it cannot drive off in its usual way, even after simple repairs (the testing definitions). A flat tire alone does not count, and neither does a broken headlight. A crash that happens only while people get in or out of a parked truck is left out. So is one that happens only while cargo is loaded or unloaded.

The rule then sorts crashes in a small table (the testing rule). Here it is in plain words. “Ticket” means what the rule calls a citation. It is a ticket to your driver, under State or local law, for a moving traffic violation that came out of this crash.

“Test” means both the alcohol test and the drug test. A ticket to the other driver does not count. Neither does a ticket for something other than a moving violation.

Now compare the facts of your crash with each row of the table. Nobody died, so the first row is out. The woman in the car gets stitches at the hospital. That is treatment away from the scene, right away, so the second row fits. Her car leaves on a tow truck because of damage, so the third row fits too. But both rows end in the same question. Did your driver get a ticket? At 11:05 p.m., he has not. The officer is still writing.

Be careful with the second row. A ride in an ambulance is not what counts; treatment is. FMCSA wrote guidance on the same words in the crash definition. It was written for that definition, not for testing, but the words are the same. It says a checkup or an x-ray alone is not treatment, but a prescription is (FMCSA’s 2022 guidance). That guidance runs until February 25, 2027. In your case the stitches settle it, and the tow would count anyway.

So while you wait, you tell your driver three things. Stay where you can be reached. Do not drink anything with alcohol in it. And answer the officer plainly and truthfully. At 11:35 p.m., the officer hands him a ticket for an unsafe lane change. That is a moving violation. It came out of this crash, 45 minutes after it. Now both tests are required, and their clocks are already running.

Chapter 02

How long do we have to get each test done?

Both clocks start at the crash, not at the ticket. The rule says to test “as soon as practicable”. If the alcohol test is not done within 2 hours, you must write down why. If it is still not done after 8 hours, you stop trying and write down why. The drug test has one limit. If it is not done within 32 hours, you stop trying and write down why (the testing rule). A missed test cannot be done later.

Put your times on paper. The crash was at 10:50 p.m. on Tuesday. The 2 hours for the alcohol test end at 12:50 a.m. The 8 hours end at 6:50 a.m. on Wednesday. The 32 hours for the drug test end at 6:50 a.m. on Thursday. It is now 11:35 p.m., so the alcohol clock is the one that matters tonight.

Your driver has two duties of his own while you work on it. He must stay “readily available” for testing. If he does not, you may treat it as a refusal to test (the testing rule). A refusal is a violation of its own, and you may not let a driver who refused drive for you (the refusal rule). He also may not drink alcohol after the crash. That ban lasts 8 hours, or until his alcohol test if it comes sooner (the rule on alcohol after a crash).

Medical care comes first. The rule never makes anyone wait for medical care. It also lets your driver leave the scene to get help, or to get emergency care for himself (the testing rule).

The two deadlines can lead to different testing requirements when a ticket comes later. Change one fact. Say the officer tells your driver he will decide on a ticket later, and writes it at 10:00 a.m. on Wednesday. That is 11 hours and 10 minutes after the crash. The alcohol test is no longer required, because the ticket came after 8 hours. The drug test still is, because 32 hours have not passed (the testing rule). If no ticket ever comes and nobody died, the rule requires neither test.

A death changes the answer, but not the clocks. Say the woman in the car had died of her injuries the next afternoon. The federal definition counts a death within 30 days of the crash (the federal definition). The crash would move to the first row: both tests, ticket or not. But the clocks would still run from 10:50 p.m. on Tuesday. By then the 8 hours for the alcohol test would be over. So you would not try it, and you would write down why. The drug test would still be due until 6:50 a.m. on Thursday (the testing rule).

In your case nobody died, and the ticket came at 11:35 p.m. Both tests are due, and you have 75 minutes left on the first clock.

Chapter 03

How do we get the driver tested far from home?

Call your consortium, the testing company that runs your drug and alcohol program. The rules describe it as a service that provides or coordinates testing for employers (the testing definitions). It can find a collection site near your driver, or a collector who comes to him. You choose the site. Tell the collector it is a post-accident test (the rule on what collectors need). Only a trained breath alcohol technician or screening test technician may do the alcohol test (the rule on alcohol testers).

At 11:40 p.m., you call the consortium’s number from the card and say both tests are due. That call is yours to make. A consortium may advise you and schedule the test, but it may not decide whether a post-accident test is needed (the rule on testing companies). The nearest clinic that does a DOT alcohol test opens at 7:00 a.m. That is after the 8 hours. So the consortium finds a mobile collector who works at night. She can meet your driver at a truck stop 12 miles away at 1:30 a.m.

The rules allow that. A drug test collection site can be in a clinic, a dedicated site or a van (the rule on collection sites). So can an alcohol testing site. After a crash, the alcohol test may even be done where privacy is only partial. That is allowed when a fully private place is not at hand (the rule on alcohol test sites).

Make sure the collector has what she needs. That means your driver’s name and ID number, your company’s details, and the reason for the test: post-accident. You or your consortium must see to it (the rule on what collectors need). Tell your driver to bring his CDL. The collector must see a photo ID, and a photocopy will not do. The alcohol test comes first where possible. The rules also tell collectors to move post-accident alcohol tests to the front of the line (the collection steps).

The police let your driver go at 12:40 a.m., and he drives to the truck stop. The collector arrives at 1:30 a.m. At 1:38 a.m., he blows into her breath testing device, and it reads 0.00. At 1:55 a.m., he gives a urine sample for the drug test. She seals it, fills in the federal drug testing form and sends it to a laboratory. The alcohol test came 48 minutes after the 2 hours ran out, but well inside the 8. The drug sample was taken on the first night, well within the 32 hours.

Say the collector had had no federal form with her. After a crash, with no time to get one, she may have to use another form. The rules say that is not a reason for the lab to reject the sample, or for the doctor who reviews results to cancel it. It is a flaw that can be corrected (the rule on forms).

What if the police had tested your driver themselves? A police breath or blood test for alcohol, or a police urine test for drugs, can count as your test. It must follow the testing rules the police work under, and you must get the results (the testing rule). Since September 29, 2022, the rule says plainly that only police or public safety officials count here. FMCSA said that was always the intent (the 2022 change). Older guides that say a test by any government official will do are out of date.

A test the hospital runs for its own reasons does not replace yours either. DOT tests must be kept completely separate from other tests (the rule on DOT and other tests). And if you cannot get the police results in hand, do not wait for them. Get your own test done within the deadlines.

If your driver is the one in the ambulance, his care comes first. A collector must not hold up his treatment to take a sample. She may not collect one for a drug test while he is unconscious (the collection steps). If a clock runs out while he is being treated, you write down why.

Then come the results. An alcohol result below 0.02 needs nothing more. At 0.02 or more but under 0.04, he may not drive for at least 24 hours. If his next regular shift starts later, he waits for it (the rule on low alcohol results). The drug result comes later from the doctor who reviews it, called the Medical Review Officer. At 0.04 or more, or with a positive drug result, your driver may not drive (the alcohol limit rule, the drug result rule). From there, our guide to the return to duty process takes over. Your driver’s alcohol test read 0.00, and on Monday, October 19, his drug result comes back negative.

Chapter 04

What do we write down when a test is late, or not needed?

Write a short record whenever a required test misses a deadline. For the alcohol test, that is after 2 hours, and again if you stop at 8. For the drug test, it is after 32 hours. The record must state the reasons the test was not done promptly, and FMCSA can ask to see it (the testing rule). The rules also make you keep the papers from each decision on a post-accident test (the rule on testing records). So write down a decision not to test, too.

On Wednesday morning, you write yours. It says when the crash happened, when the ticket came, what you did and at what time. It gives the plain reason for the delay. No site near your driver did alcohol tests at night, and the collector could not get there sooner. Yours could read like this. Fill in the parts in brackets.

Post-accident test record. Driver [name]. Crash on October 13, 2026, at 10:50 p.m., [place].

Why tests were required. The other driver was taken by ambulance and treated at [hospital]. Her car was towed away with damage. At 11:35 p.m., police gave our driver a ticket for an unsafe lane change.

What we did. 11:40 p.m.: called [consortium]. The nearest clinic doing DOT alcohol tests opened at 7:00 a.m. The earliest mobile collector was booked for 1:30 a.m. Police released the driver at 12:40 a.m.

Why the alcohol test was late. No alcohol test could be done within 2 hours. It was done at 1:38 a.m. The drug test sample was collected at 1:55 a.m.

Signed: [your name], owner, October 14, 2026.

Notice what it does not do. It does not dress up the delay or guess. It gives times and reasons you can back up with your phone log and the collector’s papers. This record is what the rule asks of you when a test comes late. It is not a way around a test you could have done.

The same habit covers a crash where no test is needed. Say that on Tuesday, November 10, 2026, your second truck is waiting at a red light when a pickup hits it from behind. The pickup is towed away, and nobody is hurt. The officer tickets the pickup’s driver, not yours. Compare the facts with the table. Nobody died and the third row fits, but your driver got no ticket. So no test is required. Write that down the same day: the crash, the facts you checked, and why the table said no. If anyone asks later why your driver was not tested, the note answers. Stay in touch with your driver for the next 32 hours, though. A ticket written in that time would still bring a drug test (the testing rule).

Keep these papers in a secure place with restricted access (the rule on testing records). Keep the papers on each decision, including the late test record, for at least 2 years. Keep a negative result for at least 1 year. Keep a positive drug result, an alcohol result of 0.02 or more, or a refusal for 5 years. When FMCSA asks, you must produce them at your main place of business within two business days.

Why take this much care? In FMCSA’s safety rating rules, failing to do a required post-accident test is a “critical” violation (the safety rating rules). FMCSA uses that word for a breakdown in how the company is managed. A refused test is worse. Letting a driver who refused keep driving fails a new company’s safety audit on the spot. It is one of 16 such mistakes (the audit failure rule). Our guide to automatic audit failures walks through all of them.

The crash itself is a separate matter from the tests. If it shows up on your safety record with the facts wrong, our guide to disputing a crash in DataQs explains how to fix that.

There are things we could not check. FMCSA’s own website refuses automated readers, so we could not open its questions and answers on post-accident testing. Nor could we see whether its 2022 guidance on treatment has changed. This page rests on the rules themselves and on FMCSA’s notices in the Federal Register. We also could not find an official list that shows which sites near a given highway do DOT tests at night. Ask your consortium how it handles a crash at night before you need it, not during one.

If you would rather have help keeping the testing papers and the crash records in order, here is what it costs.