CDL Requirements: Age, Medical Card, Clearinghouse

A 19-year-old with a Texas Class A CDL can run Dallas to Houston every day this week. Put the same driver in the same truck across the Red River into Oklahoma once, and he is not qualified to be at the wheel — no medical card, Clearinghouse query or road test cures it. The rule that does it is seven words in 49 CFR 391.11(b)(1): "Is at least 21 years old."

Everything below is paperwork, not medicine. The regulation sets out which conditions matter; a certified medical examiner decides whether you have one, and nothing here is medical advice or a prediction of what any examiner will find. I read the federal text quoted here through the eCFR on 23 August 2026, against Title 49 as last amended 19 August 2026 and up to date as of 20 August 2026.

Twenty-one is federal. Eighteen belongs to your state.

Section 391.11(b) is a list of seven qualifications, and age is only the first. The others: English proficiency, the ability to operate the vehicle safely by reason of experience or training, physical qualification under subpart E, one valid license from one state, no disqualification under 391.15, and a road test or an accepted equivalent.

The states run a parallel track. A commercial learner's permit can issue at 18 under 383.71(a)(1), and the intrastate floor is a state question. Texas answers it in a single line — the department "may not issue a commercial driver's license or a commercial learner's permit to a person who is younger than 18 years of age" (Tex. Transp. Code 522.027). California is stricter and says it from the employment side: no one under 21 "may drive a motor vehicle... that is engaged in interstate commerce, or any motor vehicle that is engaged in the interstate or intrastate transportation of hazardous material," and no one under 18 may be employed for compensation to drive at all (Veh. Code 12515).

The under-21 license is stamped for it. 383.153(a)(10)(vii) defines restriction code K as "Intrastate only."

Between 2022 and 2025 there was one legal way around that stamp. The Safe Driver Apprenticeship Pilot Program, announced at 87 FR 2477, gave apprentices relief from the effect of the K restriction and an exemption from 391.11(b)(1). The price was two probationary periods — 120 hours, then 280 hours of on-duty time with not less than 160 of those spent driving — an experienced driver in the passenger seat throughout, and a truck with an automatic or automated transmission, active braking collision mitigation, a forward-facing video event capture system, and a governed speed of 65 mph. No passengers, no hazmat, no doubles or triples, no cargo tanks. FMCSA opened applications on 26 July 2022; by the end of 2023 the program had 36 apprentices, 1.2 percent of the 3,000 the statute allowed, and was set to conclude in November 2025 (CRS R48244, 23 October 2024). The original notice already wrote the ending: at termination, an apprentice who completed the program "may continue to drive a CMV in interstate commerce until turning 21, unless it is determined a safety concern exists."

So if you are 18, 19 or 20 in 2026, the realistic route is a state CDL with a K on it and a birthday to wait for. Intrastate is not a rules-free zone, either — states taking Motor Carrier Safety Assistance Program money must keep compatible rules that generally extend part 391, including 391.11, to intrastate operations (49 CFR part 350, subpart C; FMCSA describes the arrangement at 91 FR 51424). Where states differ is in the variances they grant, especially for vision and diabetes.

The physical is a thirteen-item list, and you are not the one reading it

391.41(b) contains thirteen numbered standards. Limb loss and limb impairment. Insulin-treated diabetes. Cardiovascular disease "of a variety known to be accompanied by syncope, dyspnea, collapse, or congestive cardiac failure." Respiratory dysfunction, high blood pressure, and rheumatic, arthritic, orthopedic, muscular, neuromuscular or vascular disease, each measured by whether it is "likely to interfere" with safe operation. Epilepsy or any other condition likely to cause loss of consciousness. Mental or psychiatric disorder on the same likely-to-interfere test. Vision: 20/40 in each eye with or without correction, 20/40 binocular, a 70-degree field in the horizontal meridian in each eye, and recognition of red, green and amber. Hearing: a forced whispered voice at five feet in the better ear, or an average loss no greater than 40 decibels at 500, 1,000 and 2,000 Hz. Schedule I drugs and habit-forming drugs. Current clinical diagnosis of alcoholism.

Three of those have a documented second door. Insulin-treated diabetes runs through 391.46, the worse-eye vision cases through 391.44, and limb loss or impairment through the skill performance evaluation certificate at 391.49. An FMCSA exemption or SPE certificate shows up on the license as restriction V (383.153(a)(10)(viii)), and 391.41(a)(1)(ii) says you carry a copy of the variance documentation on duty.

The exam itself belongs to a person on the National Registry (391.43(a)), with one carve-out: a licensed ophthalmologist or optometrist may perform the vision portion. Results go on Form MCSA-5875; the certificate is Form MCSA-5876; the examiner keeps both for three years and must produce them to an authorized federal, state or local enforcement representative within 48 hours. Certification lasts 24 months at most under 391.45(b), 12 months for the insulin and alternate-vision paths, and a fresh exam is owed whenever injury or disease has impaired your ability to do the job.

One change from June 2025 deserves its own sentence, because it has no paper trail you control. Under 391.43(g)(3), if the examiner finds you not physically qualified, that finding goes to FMCSA and "all medical examiner's certificates previously issued to the person are not valid." A card in your wallet from four months ago is not a fallback. If the examiner needs more information, 391.43(g)(4) gives you 45 days and reports the exam as pending in the meantime.

Nor is there an old-timer's exception left. In its July 2026 technical amendments FMCSA stated plainly that "as of 2025, FMCSA has eliminated all medical grandfathering provisions from the FMCSR, and there are no longer any drivers medically qualified via grandfathering" (91 FR 45653). The intracity-zone exemption at 391.62 is still printed, but read its conditions: it reaches only a person who was operating throughout the one-year period ending 18 November 1988, with a condition that existed on 1 July 1988.

Since June 2025 the card is a data feed, and five states were still catching up

The Medical Examiner's Certification Integration rule turned the medical card into a transmission. The examiner uploads results to FMCSA by midnight of the next calendar day (391.43(g)(5)(i)(B)); FMCSA sends them to the state licensing agency; and a CDL or CLP holder "no longer needs to carry on his or her person the medical examiner's certificate" (391.41(a)(2)(i)(B)). If the electronic record and your paper copy disagree, the electronic record wins — 391.41(a)(2)(iv) says so, and 383.73(o)(6) repeats it.

What still belongs to you is the self-certification. At 383.71(b)(1) you pick one of four categories, and only the first — non-excepted interstate — obliges you to be medically certified under 391.45. Choose it and then fail to keep a current certificate, and the state posts a status of "not-certified" and starts a downgrade under 383.73(o)(4). A downgrade is not always a lost license: 383.5 defines it four ways, including a forced switch to intrastate-only, with removal of the CDL privilege as the fourth.

Then there is a live exception with a date on it. FMCSA granted an exemption effective 11 April 2026 through 11 October 2026 allowing drivers and carriers nationwide to rely on a paper copy of the certificate for up to 60 days from issue, because implementation was uneven: 45 states and the District of Columbia had implemented, while "Alaska, California, Kentucky, Louisiana, and New Hampshire have not yet implemented NRII and are continuing to rely on the paper MEC" (91 FR 19255, 14 April 2026). The exemption has a condition attached in both directions — it does not apply to a driver, or to a carrier, without a copy of the current certificate issued within the prior 60 days. FMCSA also wrote that it "does not anticipate granting additional, nationwide NRII waivers or exemptions" after those six months.

One truck, one driver, and a random pool that needs two people

The rule that surprises new owner-operators is 382.103(b): an employer who employs only himself or herself as a driver "shall implement a random alcohol and controlled substances testing program of two or more covered employees in the random testing selection pool." That is what a consortium/third-party administrator sells you — a pool you cannot legally be alone in.

Before the first safety-sensitive function, 382.301(a) requires a verified negative controlled substances result in the employer's hands. The exception at 382.301(b) is narrower than it sounds: you must have been in a compliant program within the previous 30 days, tested within the past six months or in the random pool for the past 12, with no known violation in the previous six months, and the employer has to obtain six specific verifications from the old program in writing. Once you are in a pool, 382.305(b) sets minimum annual random rates of 10 percent for alcohol and 50 percent for controlled substances, as printed on 20 August 2026; the Administrator can move either by Federal Register notice effective the following 1 January, so check the current-year notice rather than an old summary. Alcohol testing is tied to duty (382.305(m)), and notification means you go now (382.305(l)).

Two lines in part 40 answer the question people actually type into a search box. 40.151(e): an MRO "must not verify a test negative based on information that a physician recommended that the employee use a drug listed in Schedule I," including under a state medical marijuana law. And 40.151(f): an assertion about hemp or another non-prescription marijuana product "is not a legitimate medical explanation." The marijuana cutoffs are 50 ng/mL on the initial test and 15 ng/mL on confirmation (40.85). What all of this costs, alongside school and licence fees, is itemised in the CDL cost breakdown.

A Clearinghouse query is a consent problem before it is a record problem

Employers must run a full query before you perform a safety-sensitive function, and at least one query a year afterwards, which may be a limited query — and if a limited query shows something exists, they have 24 hours to run a full one or park you (382.701). Every one of those needs your consent, and the full query needs it electronically, through the Clearinghouse, from an account you registered yourself (382.703, 382.709, 382.711). Section 382.703(c) closes the loop: no employer may let a driver work who refuses to grant that consent. Checking your own record costs nothing — 382.721 permits FMCSA to charge employers and bars any fee for a driver's own information.

A violation record is not a lifetime entry, but the clock is conditional. Under 382.719(a) the record stops being visible only after the substance abuse professional reports completion, the employer reports a negative return-to-duty test, the current employer reports all follow-up tests done, and five years have passed since the violation determination. The return-to-duty process itself lives in part 40, subpart O: a SAP with one of six listed credentials (40.281) writes a follow-up plan of at least six unannounced tests in the first 12 months back, and that plan follows you to the next employer and through breaks in service (40.307(d), (e)).

Since 18 November 2024 the states are wired in. They must query the Clearinghouse before issuing, renewing, upgrading or transferring a CLP or CDL and must refuse where the driver is prohibited (383.73(a)(8), (b)(10), (d)(9), (e)(8); 382.725(a)(2)), and on notice that a current holder is prohibited under 382.501(a), the state must complete a downgrade "within 60 days of the State's receipt of such notification" (383.73(q)). If the entry was wrong, 382.717 is the only correction route — administrative errors only, evidence required or the petition is dismissed, and a written decision within 45 days. Test results themselves cannot be contested there.

One printing oddity, for anyone matching citations across parts: 40.25(a)(2) directs FMCSA-regulated employers to use the Clearinghouse "in accordance with 49 CFR 382.71(a)." Part 382 has no section 382.71. The query requirement is at 382.701(a).

The file the carrier builds, and the five business days you get to see it

Your application is longer than a normal job application by law. 391.21(b) requires three years of addresses, accidents and violations, plus three years of employers — and for CDL drivers, seven more years on top of that. Ten years of employment history, listed with dates and reasons for leaving.

Then the carrier goes out and checks. Within 30 days of your start date it must pull your motor vehicle record from every licensing authority you held a licence with in the past three years, and investigate your safety performance history with DOT-regulated employers over the same period (391.23). Drug and alcohol history comes through the Clearinghouse for FMCSA-regulated employers, and 391.23(f)(2) says a refusal to consent to that query means you do not drive for them.

The part almost nobody uses is 391.23(i) and (j). The prospective employer must tell you in writing, before any hiring decision, that you may review what previous employers said, have errors corrected and resent, and attach a rebuttal if you and the old employer cannot agree. You request it in writing, any time up to 30 days after being hired or being told no. The employer then has five business days. The previous employer must correct the record or tell you it will not within 15 days, and must forward a rebuttal within five business days and keep it attached for future inquiries. All of it lands in the driver qualification file described at 391.51, which is also where a criminal record becomes a separate question — one that runs through boards and, for a CDL, through the federal table at 383.51 instead. That distinction is worked through in predetermination requests when you have a conviction.

The other sentence in 391.11(b) that can end a trip at the scale

Age gets the attention; the qualification directly under it has moved faster. Section 391.11(b)(2) requires a driver who can "read and speak the English language sufficiently to converse with the general public, to understand highway traffic signs and signals in the English language, to respond to official inquiries, and to make entries on reports and records." That text is old — FMCSA traces it to a 1936 Interstate Commerce Commission rule. Enforcement is new. After Executive Order 14286 of 28 April 2025, FMCSA rescinded its 2016 policy by memorandum MC-SEE-2025-0001 on 20 May 2025, and the CVSA out-of-service criteria began treating a 391.11(b)(2) violation as an out-of-service item on 25 June 2025. A further memorandum on 16 April 2026 added a two-step analysis for drivers working inside the U.S.-Mexico border commercial zones. FMCSA is now proposing to write the out-of-service consequence into the regulations themselves, in a new 391.11(c) and the definition at 390.5T (91 FR 51422, 10 August 2026).

Two dates on the calendar, and one on your own card

Comments on the English proficiency proposal close on 9 October 2026, in docket FMCSA-2026-0826 — that is the window in which a driver can put an experience on the record rather than read about it later.

Two days after that, on 11 October 2026, the paper medical certificate exemption expires. If your licence comes from Alaska, California, Kentucky, Louisiana or New Hampshire, the question worth asking your licensing agency before then is narrow and answerable: does my record show a medical certification status of "certified," and what date does it show it through? The 24-month clock in 391.45(b) is the one card in this pile that expires on a schedule you can see coming, which is more than can be said for the cards that never expire and the four that do.