What Is a CDL DWI?
A CDL DWI is a drunk driving charge against a driver who holds a commercial driver's license. The name is shorthand, but the consequences are anything but minor. If you are not a commercial driver but were licensed out of state, read our page for out-of-state DWI attorneys instead.
A single conviction can end a driving career, because two sets of rules apply at once and neither one cancels the other. A regular driver answers to state court. A commercial driver answers to state court and to the federal disqualification rules stacked on top of it.
South Carolina uses the words "DUI" and "DUAC" in its statutes, while "CDL DWI" is the phrase drivers actually type into a search engine. The law works the same either way.
You can face this charge behind the wheel of a tractor-trailer, and you can face it in your own car, off the clock, on a Sunday afternoon.
CDL DWI Laws: Two Layers of Rules
CDL DWI laws come from two places. Federal trucking rules set the CDL disqualification periods, and South Carolina's driving under the influence law defines the crime and the sentence.
Here is the split in plain terms.
- Federal rules decide how long a driver loses the CDL.
- State law decides the fine, the jail time, and the criminal record.
Both land at the same time, and neither one waits on the other. That is why a commercial driver's DUI case carries roughly twice the weight of an ordinary one.
The 0.04% Limit for Commercial Drivers
Behind the wheel of a commercial vehicle, the limit is half the normal one. Federal rules put it at 0.04%, while every other driver on the road is measured against 0.08%.
Two people can blow the same reading on the same night, and only one of them loses a livelihood.
In a personal vehicle, the 0.08% limit applies to a commercial driver as well, and that does not protect the CDL. A DUI conviction at 0.08% in a personal car still costs the driver a commercial license.
South Carolina's implied consent law adds one more layer. Drive here and you have already agreed to a chemical test of your breath, blood, or urine.
Refusing that test carries its own price. A refusal brings a six-month license suspension, which a driver can cut short by enrolling in the Ignition Interlock Device Program. For a commercial driver, the refusal by itself can also start the federal disqualification.
Can You Get a DUI With a CDL in a Personal Vehicle?
DUI With CDL in Personal Vehicle: The Short Answer
Yes. A DUI with a CDL in a personal vehicle still costs the driver that CDL.
This is the misconception we hear most often, because drivers assume that what they do off the clock stays off their commercial record. It does not.
Federal rules follow the driver, not the vehicle, so any DUI conviction qualifies. It makes no difference whether the driver was hauling freight across two states or running errands a mile from home.
Several other kinds of conduct count the same way.
- Refusing a breath or blood test
- Leaving the scene of an accident
- Using a vehicle in the commission of a felony
South Carolina reports each of these convictions to the Commercial Driver's License Information System, whatever the driver happened to be driving at the time. Once the conviction is on the driver's record, the federal disqualification periods apply.
How Long Do You Lose Your CDL?
The two tracks run side by side: federal rules control the disqualification, and South Carolina law controls the criminal sentence. Here is what the federal side looks like.
First offense: one year with no CDL. During that year a driver may not operate a commercial motor vehicle at all, and there is no work permit and no partial CDL.
Hazmat loads: three years instead of one, but only if the driver was operating a commercial vehicle transporting hazardous materials at the time.
Second offense: a lifetime disqualification. A state may reinstate the driver after ten years, and only if the driver completes an approved rehabilitation program. Nothing about that is promised.
Refusing the test: a refusal qualifies on its own, so a driver does not need a conviction for the disqualification clock to start.
The Criminal Case in South Carolina
State penalties run on their own track. A first offense brings a fine of four hundred dollars, or imprisonment of at least forty-eight hours and up to thirty days.
A higher reading costs more.
- 0.10% or more but less than 0.16%: a five hundred dollar fine, or at least seventy-two hours in jail
- 0.16% and above: a one thousand dollar fine, or thirty to ninety days in jail
No part of the minimum sentence may be suspended. A second offense costs far more and carries longer mandatory jail time, and every convicted driver must also complete the Alcohol and Drug Safety Action Program.
Under South Carolina law, a person convicted of DUI must install an ignition interlock device on any motor vehicle they drive, except a moped or motorcycle.
One point matters more than all the rest. The CDL disqualification cannot be shortened, traded, or waived, because no hardship CDL exists anywhere in federal law.
What a CDL DWI Does to Your Job
The court date ends, but the employment problem does not. A disqualification takes away the only work many commercial drivers have ever done.
Two separate notices come due after a conviction, and both are easy to miss.
- Within thirty days: federal regulations require a driver to notify their current employer in writing about the conviction. This covers any traffic offense other than parking, in any type of vehicle.
- Before the end of the next business day: a driver must also notify the motor carrier that employs them after learning that their commercial driving privilege has been suspended or revoked.
Miss either notice and you have committed a federal violation on top of everything else. Many drivers learn that the hard way, long after the criminal case is finished.
Employers run their own numbers. Insurance carriers that cover commercial fleets often refuse to insure a driver with a DUI on the record, and many carriers will not hire that driver even after the CDL is reinstated.
The Pre-Employment Screening Program adds to the paper trail. The Federal Motor Carrier Safety Administration maintains it, and it makes a driver's crash and roadside inspection history available to any carrier considering that driver.
Medical certification can become complicated as well. A DUI by itself may not disqualify a driver medically, but court-ordered treatment, a substance abuse evaluation, or a diagnosis that surfaces along the way could affect eligibility.
Then there is the money. Lost wages during the disqualification, higher insurance rates, program fees, interlock fees, and legal expenses all add up quickly.
Defenses in a CDL DUI Case
The stakes are higher for a commercial driver, so the review of the case has to be deeper. A few themes come up again and again in South Carolina cases.
The Traffic Stop
Did the officer have a reason to pull the driver over? If not, the evidence gathered afterward may be subject to suppression. Every stop turns on its own facts.
The Breath Test
South Carolina uses the Datamaster machine for breath testing. The questions that matter are whether the machine was calibrated, whether the operator was certified, and whether the observation period was honored.
Under South Carolina law, a breath sample must be collected within two hours of the arrest. A 0.08% simulator test must run first, and it has to read between 0.076% and 0.084%.
Field Sobriety Tests
Uneven ground, poor lighting, and bad weather all skew these tests. Where a test is given can matter as much as how the driver performs on it.
The Video Recording
South Carolina law requires that a person arrested for DUI have their conduct recorded. The requirements are strict. The camera must roll at the incident site and again at the breath test site, and recording must begin no later than the activation of the blue lights. It has to cover any field sobriety tests and the arrest itself.
At the breath test site, the entire procedure must be on video. So must the twenty-minute waiting period before it, unless the officer swears that recording it was physically impossible. A gap in the recording can be a reason to challenge the evidence.
Rising Blood Alcohol
Alcohol keeps climbing for a while after the last drink. A driver can be under the legal limit at the wheel and over it an hour later at the station.
The Plea Negotiation
Plea talks need extra care in these cases. Disqualification follows a conviction or a plea to a qualifying offense, so a reduction to reckless driving may or may not preserve the CDL. Much depends on how the charge reports. Ask a defense lawyer about your own case before you agree to anything.
Frequently Asked Questions About CDL DWI
What Happens to My CDL if I Get a DUI in My Personal Vehicle?
You still lose it. Federal rules follow the driver rather than the vehicle, and South Carolina reports the conviction regardless of the vehicle involved. A first offense costs a driver the CDL for one year, and a second offense costs it for life.
What Is the BAC Limit for a CDL Holder in South Carolina?
In a commercial motor vehicle the limit is 0.04% under federal regulations, which is half the 0.08% standard that applies to everyone else. In a personal vehicle the 0.08% limit applies, and a conviction at that level still costs that driver the CDL.
How Long Is a CDL Disqualified After a First DWI Conviction?
One year under federal regulations. It stretches to three years if the driver was hauling hazardous materials in a commercial vehicle. No hardship or provisional CDL is available while the disqualification runs.
Can I Get a Hardship License for My CDL After a DUI?
No. Federal law offers no hardship, provisional, or restricted CDL during a disqualification. South Carolina may offer options for a regular driver's license through the Ignition Interlock Device Program, but those options stop at the commercial license. The CDL disqualification must run its full term.
Talk to a Greenville CDL DUI Lawyer
A CDL DUI case is about far more than a fine. Your ability to earn a living is on the line, the administrative deadlines are short, and the clock starts at the arrest.
Sumner & Todd, Attorneys at Law handles DUI defense across the Upstate, including Greenville, Spartanburg, Anderson, and Pickens counties. Call the firm for a free consultation and talk the case through with an attorney.
Every case is different, and outcomes depend on the specific facts. The sooner you call a lawyer, the more room there is to protect your CDL and your career.