A DWI or a drug conviction can cost you your commercial driver license. Under federal rules, a first major offense disqualifies a CDL for one year, and that disqualification can apply even if you were driving your own personal car at the time.
This is a general overview and is not legal advice.
For a commercial driver, a DWI is two problems at once. There is the criminal case in a Collin County court, and there is a separate hit to your CDL that follows federal law no matter how the criminal case turns out. If you drive a truck or a bus for a living, the license is the livelihood, so it helps to understand both pieces early.
The federal rules control your CDL, not just Texas
Texas issues your CDL, but the disqualification rules come from the federal government. They live in the Federal Motor Carrier Safety Regulations, specifically 49 CFR 383.51. Texas has to follow them to keep its CDL program in line with federal standards. That is why a CDL holder cannot count on local leniency to protect the commercial license the way a regular driver sometimes can.
Two ideas drive almost everything below. First, the rules treat certain offenses as “major offenses.” Second, they count those offenses whether you committed them in a commercial vehicle or in your own personal vehicle.
A first major offense disqualifies a CDL for one year
Under 49 CFR 383.51, a first major offense disqualifies a CDL for one year. If you were transporting hazardous materials that require placards when the offense happened, that period goes up to three years.
The list of major offenses includes:
- Driving under the influence of alcohol as set by state law
- Driving under the influence of a controlled substance
- Having an alcohol concentration of 0.04 or greater while operating a commercial vehicle
- Refusing a required alcohol test
- Leaving the scene of an accident
- Using a vehicle to commit a felony
- Causing a fatality through negligent operation of a commercial vehicle
A Texas DWI and a serious drug charge can both land on this list. So can a refusal. A driver who declines the breath or blood test to avoid the criminal case can still trigger the same one-year CDL disqualification.
It applies even in your personal vehicle
This part surprises a lot of drivers. The disqualification can apply even if the offense happened in your personal vehicle, not the truck.
The federal table that covers major offenses in a non-commercial vehicle sets the same one-year disqualification for a first offense and a lifetime disqualification for a second. So a Saturday-night DWI in your own pickup, with the company truck parked at the yard, can still cost you the CDL. The commercial license rides on your conduct as a driver, period.
The commercial alcohol limit is 0.04, half the usual 0.08
For most Texas drivers, the legal alcohol concentration limit is 0.08. For a person operating a commercial vehicle, the limit is 0.04. That is half the standard.
A driver could blow under 0.08 and still face a major offense on the CDL side if they were operating a commercial vehicle at 0.04 or above. The lower number reflects how much weight and risk a commercial vehicle carries.
A second major offense triggers a lifetime disqualification
A second major offense, in a separate incident, results in a lifetime CDL disqualification. The rule counts any combination of the listed major offenses, so a DWI and a later refusal can together reach the lifetime mark.
There is a narrow path back. The regulation lets a state reinstate a lifetime-disqualified driver after ten years if that person voluntarily enters and completes a state-approved rehabilitation program. It is a limited exception, not a reset button, and a driver who earns reinstatement and is then convicted of another disqualifying offense cannot be reinstated again.
”Serious traffic violations” carry their own shorter disqualifications
Beyond the major offenses, federal rules treat a separate group of “serious traffic violations” more harshly for repeat offenders. Things like excessive speeding, reckless driving, improper lane changes, and following too closely fall in this group.
A single serious traffic violation usually does not disqualify a CDL. But a second conviction within three years brings a 60-day disqualification, and a third conviction within three years brings a 120-day disqualification. For a working driver, even two months off the road is a real loss.
Deferred adjudication and diversion usually will not hide it
In a regular Texas case, deferred adjudication or a diversion program can sometimes keep a conviction off a person’s public record. For CDL holders, federal law cuts that off.
Under 49 CFR 384.226, a state may not mask, defer imposition of judgment, or allow a CDL holder into a diversion program that would keep the conviction from appearing on the commercial driving record. This is the “no masking” rule. It means the usual tools that soften a first offense for an ordinary driver often do not protect the commercial license the same way. A resolution that looks fine for a non-CDL driver can still hit the CDL record.
Why the criminal case and the CDL outcome are linked
Here is the through-line. The CDL disqualification keys off what happens in the criminal case. A conviction, a finding, or a refusal on the record is what the disqualification rules read from. So the choices made in the DWI or drug case, from the first day, shape what lands on the commercial record.
That is why defense strategy matters from the start for a CDL holder. The breath or blood test, the stop itself, the charge, and how the case resolves all feed into the federal consequence. Working the criminal case and the license consequence together, rather than treating them as separate problems, gives a driver the clearest view of what is at stake.
If you hold a CDL and you are facing a DWI or a drug charge in Collin County, talk to a McKinney DWI lawyer before the criminal case sets the record. Call (214) 982-1408 for a free, confidential consultation.
This article is general legal information about Texas law and is not legal advice. Reading it does not create an attorney-client relationship. For advice about a specific situation, consult a licensed attorney.