A truck driver who blacks out, has a seizure or falls asleep at the wheel can turn an 80,000-pound rig into a weapon. When that happens, the trucking company's first defense is often "sudden medical emergency": nobody could have seen it coming. The truck driver medical card (the DOT medical certificate), the driver's medical records and the company's own files often tell a different story. Here's how truck driver medical fitness works under federal law, and how those records can prove a Kentucky truck crash was preventable.
Key takeaways: truck driver medical card
- Commercial drivers must be medically certified under FMCSA driver medical requirements, and the card lasts up to 24 months.
- Untreated moderate to severe sleep apnea usually keeps a driver from being certified; CPAP use data can prove non-compliance.
- The trucking company must keep medical proof in the driver qualification file and can be liable for letting an unfit driver run.
- A “sudden medical emergency” defense fails when the condition was known or foreseeable.
What a truck driver medical card is
Federal law says a commercial truck driver may not drive unless they are medically certified as physically qualified, and the driver generally must carry a current medical examiner's certificate while on duty (49 CFR 391.41). People call this the "DOT medical card."
- Who does the exam. The exam must be done by a medical examiner listed on FMCSA's National Registry of Certified Medical Examiners (49 CFR 391.43).
- How long it lasts. A certificate is good for up to 24 months. Examiners can certify a driver for a shorter time, for example to monitor high blood pressure, and drivers with some conditions, such as insulin-treated diabetes, must be re-examined every year (49 CFR 391.45).
- Where the record goes. Since June 23, 2025, examiners report CDL drivers' exam results to the National Registry, which sends them electronically to the state licensing agency to post on the driver's record (FMCSA).
- The carrier keeps a copy. The trucking company must keep proof of the driver's medical certification in the driver qualification file (49 CFR 391.51).
Conditions that can disqualify a truck driver
The physical standards in 49 CFR 391.41(b) cover conditions that can cause a driver to lose control suddenly, including:
- Epilepsy or a history of seizures or loss of consciousness
- Heart disease that can cause fainting, shortness of breath or chest pain
- High blood pressure likely to interfere with safe driving
- Respiratory problems likely to interfere with safe driving, which is where sleep apnea comes in
- Vision and hearing below the federal minimums
- Use of certain drugs and narcotics, and a current clinical diagnosis of alcoholism
A medical card is only as good as the exam behind it. Drivers fill out their own health history, and an examiner can't flag a condition the driver hides.
Sleep apnea and truck crashes
Obstructive sleep apnea makes a person stop breathing again and again during sleep. The result is heavy daytime sleepiness, slower reactions and "microsleeps" that last a few seconds, long enough to drift across a lane on I-65 or miss stopped traffic on the Watterson.
There is no stand-alone federal sleep apnea rule for truck drivers. FMCSA withdrew its proposed rule in 2017. Instead, sleep apnea falls under the respiratory standard, and examiners use their judgment. Drivers with signs like a high BMI, loud snoring, a large neck or reported sleepiness are often referred for a sleep study, and a driver diagnosed with moderate to severe apnea is usually certified only if they use treatment, typically a CPAP machine.
That creates strong evidence in a crash case:
- CPAP compliance data. Most CPAP machines record nightly use. If the driver was prescribed CPAP and wasn't using it, the data shows it.
- Referrals that were ignored. An examiner's note that the driver needed a sleep study, followed by no sleep study, matters.
- Short certificates. A one-year or 90-day card can show the examiner had concerns.
Fatigue from apnea also compounds hours-of-service problems. See our page on truck driver fatigue.
When the trucking company is responsible
Federal rules don't only bind the driver. A carrier can't let a driver operate without proper medical certification, and it has to keep the medical proof in the driver's file. If the company let a driver run with an expired card, knew about seizures or blackouts, or ignored complaints that a driver was nodding off, it can be liable for its own negligence, not just the driver's. See trucking company liability and how we use FMCSA safety records to check a carrier's history.
The "sudden medical emergency" defense
Kentucky courts recognize that a driver who suddenly loses consciousness without warning may not be negligent. But the defense depends on the emergency being truly unforeseeable. For how this works in car crashes, see fault when a driver has a sudden medical emergency. If the driver had prior episodes, skipped medication, ignored a diagnosis or lied on the exam form, the event wasn't sudden or unforeseen, and the defense usually falls apart. The medical records are where that fight is won or lost.
How to get a truck driver's medical records
Medical records are private, so you can't just ask for them. In a lawsuit, they come through the discovery process:
- Preservation letter. Right after the crash, we send the carrier a letter demanding it keep the driver qualification file, medical certificates, ELD data and dispatch records.
- The driver qualification file from the carrier, which includes medical certification, the driving record and prior employer checks.
- Requests and subpoenas for the medical examiner's long-form exam report, the driver's treating doctors, pharmacy records, sleep study results and CPAP data. Courts usually allow this when the driver's health is a real issue in the case, for example when the company claims a medical emergency.
- The driver's state record showing medical certification status, and any lapses.
- Depositions of the driver, the safety director and sometimes the medical examiner.
Timing matters. Records and device data get overwritten or thrown out, which is why we act in the first days. Our guide to evidence to preserve after an accident explains more.
How Forman & Associates handles these cases
We move fast to lock down the driver's medical file, the qualification file, the truck's black box data and the carrier's safety history. We prepare every case for trial from the start. Larry Forman has tried 50+ jury trials and won 95% of them. See our truck wreck lawyer page for more.
Most Kentucky motor vehicle injury claims must be filed within two years of the crash or the last PIP payment, whichever is later (KRS 304.39-230(6)). See our Kentucky statute of limitations guide.
Truck driver medical fitness FAQs
How long is a DOT medical card good for?
Up to 24 months. An examiner can certify a driver for a shorter period to monitor a condition, and some conditions require a yearly exam.
Can a truck driver with sleep apnea legally drive?
Often yes, if the apnea is treated, usually with a CPAP machine used as prescribed. An untreated driver with moderate to severe apnea generally shouldn't be certified.
Can I get the truck driver's medical records after a crash?
Usually through a lawsuit, when the driver's health is at issue. The carrier's driver qualification file, the medical examiner's report, treating records and CPAP data can all be requested or subpoenaed.
What if the driver says they had a sudden medical emergency?
The defense only works if the emergency was truly unforeseeable. Prior symptoms, an ignored diagnosis, skipped medication or a false exam form can defeat it.
Is the trucking company responsible for a driver's medical condition?
It can be. A carrier that let a driver operate without valid medical certification, or ignored warning signs about the driver's health, can be liable for its own negligence.
Talk to a Kentucky truck accident lawyer
Hurt in a crash with a commercial truck in Kentucky? Call (502) 931-6788 or request a free consultation. No fee unless we win.
This post is general information about Kentucky and federal law as of October 2026, not legal advice.
