Seeing an 18-wheeler barreling toward you and knowing there is nothing you can do to avoid the collision is one of the scariest sights a Dallas-Fort Worth driver can face.
Finding out later that the truck driver was intoxicated can be infuriating, confusing, and devastating especially after you or a loved one has suffered life-changing injuries.
Commercial truck drivers operate massive vehicles that can weigh tens of thousands of pounds. When an 18-wheeler driver is under the influence of alcohol, illegal drugs, prescription medication, or another impairing substance, that driver is not just risking a traffic ticket. They are putting families, commuters, construction workers, and everyone else on DFW roads in danger.
An impaired truck driver may fail to brake for stopped traffic on I-35E, run a red light in Dallas, drift into another lane on I-30, speed through a Fort Worth work zone, rear-end vehicles on I-635, or lose control of an 80,000-pound commercial vehicle. Unlike an ordinary car crash, a Dallas-Fort Worth 18-wheeler wreck involving an impaired driver can easily become a catastrophic injury or wrongful death case.
This is exactly why federal law requires commercial trucking companies and truck drivers to follow strict drug and alcohol testing rules.
These rules are supposed to keep unsafe drivers out of commercial motor vehicles. When a trucking company ignores them, fails to check a driver’s history, skips required testing, or allows a driver with warning signs of impairment to keep driving, the company may be held responsible for the harm that follows.
Impaired Truck Driving Is a Real Danger on Dallas-Fort Worth Roads
Drug and alcohol issues involving commercial drivers are not just something lawyers talk about after a truck crash. These cases actually happen in Texas.
Sometimes alcohol is alleged. Sometimes investigators look at illegal drugs, prescription medications, controlled substances, or a refusal to test. In serious Dallas-Fort Worth truck wreck cases, these facts can change the entire investigation.
They can also raise an important question:
Was this only the fault of one impaired truck driver, or did the trucking company fail to follow federal safety rules that could have prevented the crash?
A Dallas-Fort Worth truck wreck lawyer should investigate both the driver and the company. In many 18-wheeler accident cases, the most important evidence is not just at the crash scene. It is inside the trucking company’s records.
Real-Life Texas Examples Involving Alleged Drug or Alcohol Use by Commercial Drivers
Texas has seen serious crashes where commercial driver impairment was investigated, alleged, or charged. These examples show why drug and alcohol evidence must be investigated quickly after a truck wreck.
Marshall, Texas: 18-Wheeler Driver Arrested After Red-Light Crash
In July 2025, police in Marshall, Texas reported that a tractor-trailer driver ran a red light at Highway 59 and Loop 390 and struck a pickup truck pulling an empty horse trailer. Two people in the pickup were injured and taken to the hospital. The crash also caused a diesel spill that required hazmat cleanup.
According to reports, the 18-wheeler driver was arrested on two counts of intoxication assault with a vehicle.
Read the news story here: CBS19 — Marshall crash injures 2, diesel spill prompts arrest.
This type of crash raises important questions in a truck accident case:
Was the driver impaired?
Did the trucking company know or have reason to know the driver was unsafe?
Was the driver properly screened before being hired?
Was the driver in a random testing pool?
Did the company complete post-accident testing?
Did the driver have any prior drug or alcohol violations?
Did the company check the FMCSA Drug and Alcohol Clearinghouse?
A red-light crash involving an 18-wheeler can cause severe injuries because passenger vehicles have little protection against the size and weight of a commercial truck.
Taylor County, Texas: Semi-Truck Driver Charged After Fatal Crash
In April 2026, reports stated that a semi-truck driver was charged with intoxication manslaughter after a fatal crash in Taylor County, Texas. According to reporting based on Texas DPS information, the truck driver was alleged to be intoxicated from an overdose of medication. The crash killed a 26-year-old pickup driver.
Read the news story here: KTXS — Florida truck driver charged with intoxication manslaughter in fatal West Texas crash.
This example shows why impairment investigations should not be limited to alcohol. Prescription medications, sedatives, opioids, sleep aids, and other substances may affect whether a commercial driver can safely operate an 18-wheeler.
In a case involving medication impairment, a Dallas-Fort Worth truck accident lawyer may need to investigate:
the driver’s medical history;
prescription medication use;
whether the driver disclosed medication use;
whether a medical provider advised the driver the medication would not affect safe operation;
whether the driver was medically qualified;
whether the company ignored warning signs; and
whether federal drug and alcohol testing rules were followed.
Laredo, Texas: Tractor-Trailer Driver Arrested After Hit-and-Run Crash Injuring Children
In February 2026, reports out of Laredo described a crash involving a tractor-trailer driver accused of speeding, rear-ending multiple vehicles, fleeing the scene, and later being found in brush after the tractor-trailer was abandoned. Reports stated that two 9-year-old children were seriously injured and that the driver faced intoxication assault and accident-involving-serious-bodily-injury charges.
Read the news story here: Laredo Morning Times — LPD: Intoxicated truck driver arrested after hit-and-run crash injured 2 children.
Crashes like this demonstrate how dangerous an impaired commercial driver can be. When an 18-wheeler driver is intoxicated, speeds, rear-ends traffic, and leaves the scene, the investigation should include both the driver’s conduct and the motor carrier’s safety practices.
Why These Examples Matter After a DFW 18-Wheeler Wreck
After a serious truck crash in Dallas, Fort Worth, Arlington, Irving, Grand Prairie, Garland, Mesquite, Plano, Frisco, McKinney, Denton, or anywhere in North Texas, it is not enough to ask whether the truck driver made a mistake.
The better question is often:
How did this driver end up behind the wheel?
A commercial driver may be unsafe because of alcohol use, illegal drugs, prescription medication, fatigue, prior violations, poor supervision, or a company that failed to enforce federal safety rules.
In many cases, the trucking company has access to information that the public does not, including drug test records, driver qualification files, Clearinghouse checks, prior violations, dispatch records, and post-crash testing documents.
That evidence can show whether the Dallas-Fort Worth truck wreck was caused by a preventable safety failure.
Federal Drug and Alcohol Testing Rules for Truck Drivers
The Federal Motor Carrier Safety Administration’s drug and alcohol testing rules are found primarily in 49 C.F.R. Part 382, which governs controlled substance and alcohol use and testing for commercial drivers.
The stated purpose of these rules is to help prevent accidents and injuries caused by alcohol misuse and controlled substance use by commercial motor vehicle drivers. 49 C.F.R. § 382.101.
These rules apply to drivers and employers of drivers who operate commercial motor vehicles in commerce and are subject to commercial driver’s license requirements. 49 C.F.R. § 382.103(a).
The regulations also require employers to ensure that all alcohol and controlled substance testing required under Part 382 complies with the federal DOT testing procedures in 49 C.F.R. Part 40. 49 C.F.R. § 382.105.
In other words, a trucking company cannot simply make up its own informal testing process. Required tests must follow federal procedures.
Who Is Covered by the FMCSA Testing Rules?
The FMCSA drug and alcohol rules generally apply to CDL drivers who operate commercial motor vehicles in commerce.
This may include drivers of:
18-wheelers;
tractor-trailers;
semi-trucks;
dump trucks;
tankers;
cement trucks;
flatbeds;
box trucks requiring a CDL;
hazmat vehicles;
commercial delivery trucks requiring a CDL; and
other qualifying commercial motor vehicles.
These rules may apply after a Dallas 18-wheeler accident, Fort Worth semi-truck crash, Arlington commercial truck wreck, or any serious DFW trucking accident involving a driver subject to federal motor carrier regulations.
The rules apply when the driver performs safety-sensitive functions. Safety-sensitive functions can include driving, inspecting or servicing a truck, waiting to be dispatched, loading or unloading in certain situations, and being ready to operate a commercial vehicle.
What Substances Are Truck Drivers Tested For?
DOT drug testing generally screens for several categories of controlled substances, including marijuana, cocaine, opioids, amphetamines and methamphetamines, and PCP.
Alcohol testing is handled separately. A commercial truck driver may not report for duty or remain on duty requiring the performance of safety-sensitive functions with an alcohol concentration of 0.04 or greater. 49 C.F.R. § 382.201.
This is stricter than the ordinary DWI limit many people associate with passenger vehicles. Federal law treats alcohol use by commercial drivers differently because of the serious danger posed by large commercial vehicles.
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Pre-Employment Drug Testing for Truck Drivers
Before a driver performs safety-sensitive functions for a motor carrier for the first time, the driver must undergo controlled substance testing, unless a regulatory exception applies. 49 C.F.R. § 382.301(a).
The employer cannot allow that driver to perform safety-sensitive functions until the employer receives a verified negative controlled substance test result. 49 C.F.R. § 382.301(a).
This matters in a Dallas-Fort Worth truck accident case because a trucking company should not put a new driver on the road before confirming that the driver passed the required drug test.
After a serious DFW truck wreck, an attorney should investigate:
whether the company completed pre-employment drug testing;
whether the result was received before the driver was dispatched;
whether the company relied on a valid exception;
whether the test was properly documented; and
whether the driver had prior drug or alcohol violations.
If the company skipped this step or allowed the driver to operate before receiving a negative test result, that may support a claim for negligent hiring, negligent supervision, or negligent entrustment.
Post-Accident Alcohol and Drug Testing After a Truck Wreck
Post-accident testing is one of the most important issues after a major truck crash.
Federal law requires post-accident alcohol testing after certain crashes involving a commercial motor vehicle operating on a public road in commerce. Alcohol testing is required when the driver was performing safety-sensitive functions and the crash involved the loss of human life. 49 C.F.R. § 382.303(a)(1).
Alcohol testing is also required when the driver receives a citation within eight hours for a moving traffic violation arising from the crash and the crash involved either bodily injury requiring immediate medical treatment away from the scene or disabling damage requiring a vehicle to be towed. 49 C.F.R. § 382.303(a)(2).
Controlled substance testing is required after a fatal crash. It is also required when the driver receives a citation within thirty-two hours for a moving traffic violation arising from a crash involving injury requiring immediate medical treatment away from the scene or disabling damage requiring towing. 49 C.F.R. § 382.303(b).
The timing of the test matters. If an alcohol test is not administered within two hours after the crash, the employer must prepare and maintain a record explaining why the test was not promptly administered. If no alcohol test is administered within eight hours, the employer must stop attempts to administer the alcohol test and prepare the required record. 49 C.F.R. § 382.303(d)(1).
If a controlled substance test is not administered within thirty-two hours after the crash, the employer must stop attempts to administer the test and prepare and maintain a record explaining why the test was not promptly administered. 49 C.F.R. § 382.303(d)(2).
A driver who is required to take a post-accident alcohol test may not use alcohol for eight hours after the crash or until the driver undergoes the test, whichever occurs first. 49 C.F.R. § 382.209.
When a trucking company fails to perform required post-accident testing after a Dallas-Fort Worth 18-wheeler wreck, that failure can become important evidence. It may raise questions about whether the company had a real safety program, whether supervisors knew the rules, and whether the company was trying to avoid a bad test result.
Random Drug and Alcohol Testing for Commercial Truck Drivers
Federal regulations require every covered employer to comply with random testing requirements, and every covered driver must submit to random alcohol and controlled substance testing. 49 C.F.R. § 382.305(a).
Random alcohol testing must be conducted at a minimum annual percentage rate set by federal regulation. 49 C.F.R. § 382.305(b)(1).
Random controlled substance testing must also be conducted at a minimum annual percentage rate set by federal regulation. 49 C.F.R. § 382.305(b)(2).
Random alcohol testing must occur just before, during, or just after the driver performs safety-sensitive functions. 49 C.F.R. § 382.305(m).
Random testing can reveal whether a trucking company has a real safety program or only a paper policy. A company that fails to conduct random testing, fails to keep proper records, or allows drivers to avoid testing may be ignoring one of its basic safety responsibilities.
Reasonable Suspicion Testing for Impaired Truck Drivers
A trucking company must require a driver to submit to an alcohol test when the employer has reasonable suspicion that the driver violated federal alcohol prohibitions. Reasonable suspicion must be based on specific, contemporaneous, articulable observations concerning the driver’s appearance, behavior, speech, or body odors. 49 C.F.R. § 382.307(a).
A trucking company must also require a controlled substance test when the employer has reasonable suspicion that the driver violated federal controlled substance prohibitions. That suspicion must also be based on specific, contemporaneous, articulable observations. 49 C.F.R. § 382.307(b).
The observations must be made by a supervisor or company official trained under the federal supervisor training rule. 49 C.F.R. § 382.307(c); 49 C.F.R. § 382.603.
Examples of reasonable suspicion may include:
slurred speech;
bloodshot eyes;
the smell of alcohol;
confusion;
erratic conduct;
difficulty staying awake;
impaired coordination;
unusual behavior; or
other signs of alcohol or drug impairment.
In a Dallas-Fort Worth truck wreck case, reasonable suspicion testing may become important if coworkers, dispatchers, supervisors, shippers, receivers, or other witnesses noticed something wrong before the crash but the company failed to act.
Return-to-Duty Testing After a Drug or Alcohol Violation
If a commercial driver violates federal drug or alcohol rules, the driver cannot simply return to driving. The driver must complete the return-to-duty process before returning to safety-sensitive work.
Federal regulations require return-to-duty testing before the driver returns to performing safety-sensitive functions. 49 C.F.R. § 382.309.
A driver who violates the alcohol or controlled substance rules may not perform safety-sensitive functions until the driver has been evaluated by a substance abuse professional, complied with the required process, and met the return-to-duty requirements. 49 C.F.R. § 382.503.
If a trucking company allows a prohibited driver to return to work before completing this process, that can be powerful evidence in a truck accident case.
Follow-Up Testing for Truck Drivers
After a driver returns to duty following a drug or alcohol violation, the driver must submit to follow-up testing as directed by a substance abuse professional. 49 C.F.R. § 382.311; 49 C.F.R. § 40.281.
The substance abuse professional must prescribe at least six unannounced follow-up tests during the first twelve months after the driver returns to duty. 49 C.F.R. § 40.307.
Follow-up testing matters because a driver with a known drug or alcohol violation presents a serious safety risk if the company does not carefully monitor compliance.
Alcohol Prohibitions for Commercial Truck Drivers
Federal regulations include several specific alcohol prohibitions for commercial drivers.
A driver may not report for duty or remain on duty requiring the performance of safety-sensitive functions with an alcohol concentration of 0.04 or greater. 49 C.F.R. § 382.201.
A driver may not use alcohol while performing safety-sensitive functions. 49 C.F.R. § 382.205.
A driver may not perform safety-sensitive functions within four hours after using alcohol. 49 C.F.R. § 382.207.
A driver required to take a post-accident alcohol test may not use alcohol for eight hours after the accident or until the driver undergoes the test, whichever occurs first. 49 C.F.R. § 382.209.
A driver may not refuse to submit to a required alcohol or controlled substance test. 49 C.F.R. § 382.211.
These rules are designed to prevent impaired commercial drivers from operating dangerous vehicles on public roads.
Controlled Substance Prohibitions for Truck Drivers
Federal law also prohibits certain controlled substance use by commercial drivers.
A driver may not report for duty or remain on duty requiring safety-sensitive functions while using any Schedule I drug or substance. 49 C.F.R. § 382.213(a).
A driver may not report for duty or remain on duty requiring safety-sensitive functions while using other controlled substances unless the use is pursuant to instructions from a licensed medical practitioner who is familiar with the driver’s medical history and has advised the driver that the substance will not adversely affect the driver’s ability to safely operate a commercial motor vehicle. 49 C.F.R. § 382.213(b).
An employer may not permit a driver to perform safety-sensitive functions if the employer has actual knowledge that the driver used controlled substances in violation of the regulation. 49 C.F.R. § 382.213(c).
A driver may not report for duty, remain on duty, or perform safety-sensitive functions if the driver tests positive or has adulterated or substituted a controlled substance test specimen. 49 C.F.R. § 382.215.
An employer may not allow a driver to perform or continue performing safety-sensitive functions if the employer has actual knowledge that the driver violated federal drug or alcohol prohibitions. 49 C.F.R. § 382.217.
The FMCSA Drug and Alcohol Clearinghouse
The FMCSA Drug and Alcohol Clearinghouse is a federal database that tracks drug and alcohol testing violations for CDL drivers. The Clearinghouse is designed to prevent drivers with unresolved drug or alcohol violations from moving from one trucking company to another without the next employer knowing.
Before allowing a driver to perform safety-sensitive functions, an employer must conduct a pre-employment query of the Clearinghouse. 49 C.F.R. § 382.701(a).
The purpose of the query is to determine whether the driver has a verified positive drug test, an adulterated or substituted controlled substance test, an alcohol confirmation test of 0.04 or higher, a refusal to submit to testing, or other reported actual knowledge of a drug or alcohol violation. 49 C.F.R. § 382.701(a)(1).
Employers must also conduct annual Clearinghouse queries for each current driver. 49 C.F.R. § 382.701(b).
Certain violations, including verified positive drug tests, alcohol confirmation tests of 0.04 or greater, refusals to test, actual knowledge violations, negative return-to-duty tests, and completion of follow-up testing, must be reported to the Clearinghouse. 49 C.F.R. § 382.705.
In a Dallas truck accident case or Fort Worth 18-wheeler wreck case, the Clearinghouse can be critical. If a driver had a prior drug or alcohol violation and the company failed to check the database, the company may have allowed a prohibited or unsafe driver on the road.
How Alcohol or Drug Violations Can Cause a Dallas-Fort Worth 18-Wheeler Crash
Alcohol and drugs can affect a truck driver in ways that are especially dangerous behind the wheel of a commercial vehicle.
Impairment can cause:
slower reaction time;
failure to brake for stopped traffic;
unsafe lane changes;
running red lights or stop signs;
following too closely;
wrong-way driving;
loss of control;
speeding through work zones;
failure to notice traffic backups;
poor judgment;
fatigue-like symptoms; and
inability to safely respond to road hazards.
Prescription medications can also be dangerous. Some medications cause drowsiness, confusion, dizziness, delayed reaction time, or impaired coordination. A truck driver does not have to be drinking alcohol or using illegal drugs to be unsafe. A driver impaired by medication can be just as dangerous as a drunk driver.
These issues can lead to devastating crashes on Dallas-Fort Worth highways, including I-35E, I-35W, I-20, I-30, I-45, I-635, US-75, US-287, SH-121, SH-183, Loop 12, and other major North Texas roads.
How the Trucking Company Can Be Held Liable After a DFW Truck Wreck
After a serious truck wreck, the truck driver is not the only party that may be responsible. The trucking company may be liable if its own conduct contributed to the crash.
A trucking company may be held responsible for:
hiring a driver without completing required drug testing;
failing to check the FMCSA Clearinghouse;
ignoring prior drug or alcohol violations;
failing to conduct random testing;
failing to perform required post-accident testing;
failing to train supervisors on reasonable suspicion testing;
allowing a driver to operate after signs of impairment;
dispatching a driver who was unsafe to drive;
failing to remove a prohibited driver from service;
failing to investigate prior crashes, citations, or safety violations;
failing to enforce company safety policies; or
creating a culture where delivery schedules matter more than public safety.
In Dallas-Fort Worth truck accident cases, this evidence may support claims for negligence, negligent hiring, negligent retention, negligent supervision, negligent entrustment, and gross negligence.
Why Company Records Matter After a Dallas-Fort Worth Truck Accident
Drug and alcohol issues are often hidden in company records. That is why evidence preservation is critical after a serious 18-wheeler crash. Important evidence may include:
the driver qualification file;
pre-employment drug test results;
Clearinghouse query records;
random testing records;
post-accident test results;
reasonable suspicion documentation;
supervisor training records;
return-to-duty records;
follow-up testing records;
dispatch records;
driver logs;
electronic logging device data;
dash camera video;
truck GPS data;
black box data;
company safety manuals;
prior crash history;
prior citations; and
communications between the driver, dispatcher, and company.
If this evidence is not requested and preserved quickly, it may be lost, overwritten, or destroyed.
A Dallas-Fort Worth truck wreck lawyer can send preservation letters, demand relevant records, investigate FMCSA violations, and determine whether the trucking company failed to follow drug and alcohol testing rules.
How a Dallas-Fort Worth Truck Wreck Lawyer Can Help After a Crash Involving Suspected Drug or Alcohol Use
Truck accident cases involving possible impairment require immediate investigation. The trucking company, insurance carrier, and defense lawyers may begin protecting themselves quickly. Important evidence can disappear if it is not preserved.
A Dallas-Fort Worth truck wreck lawyer can help by:
sending evidence preservation letters;
investigating the driver’s qualification file;
requesting drug and alcohol testing records;
determining whether post-accident testing was required;
reviewing FMCSA Drug and Alcohol Clearinghouse compliance;
obtaining the Texas crash report;
securing witness statements;
reviewing black box data;
obtaining dash camera or surveillance video;
investigating prior crashes and citations;
reviewing company safety policies; and
determining whether the company violated federal trucking regulations.
An attorney can also investigate whether the trucking company had a pattern of ignoring safety issues. Sometimes the crash is not just about one bad decision by one driver. It may be about a company that hired the wrong driver, failed to train supervisors, ignored warning signs, failed to test, or allowed an unsafe driver to continue operating a commercial vehicle.
A thorough investigation may uncover evidence of:
negligent hiring;
negligent entrustment;
negligent supervision;
negligent retention;
failure to train;
failure to test;
failure to remove a prohibited driver from service;
FMCSA violations; and
gross negligence.
This evidence can be critical in a Dallas-Fort Worth truck accident case. It may help prove that the crash was preventable and that the trucking company, not just the driver, should be held accountable.
Injured in a Dallas-Fort Worth 18-Wheeler Wreck? The Wooley Law Firm Can Help.
If you or a loved one was injured in a crash involving an 18-wheeler, semi-truck, commercial truck, dump truck, tanker, or delivery vehicle in Dallas-Fort Worth, it is important to investigate the truck driver and the trucking company immediately.
The Wooley Law Firm represents people injured in serious truck wrecks across Dallas, Fort Worth, Arlington, Irving, Grand Prairie, Garland, Mesquite, Richardson, Plano, Frisco, McKinney, Denton, and throughout North Texas.
Our firm investigates evidence of driver impairment, FMCSA violations, unsafe hiring practices, failed drug and alcohol testing procedures, hours-of-service violations, negligent supervision, and company safety failures.
If a trucking company put an unsafe driver on the road, it should be held accountable.
You do not pay unless we win.
Contact The Wooley Law Firm today for a free consultation with a Dallas-Fort Worth truck wreck lawyer. Call (214) 699-6524 for a free consultation. You don’t pay unless we win.
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Andrew J. Wooley
Personal Injury Attorney
Andrew J. Wooley is a dedicated personal injury attorney based in Dallas, Texas. He focuses on helping accident victims recover fair compensation for their injuries. With a commitment to personalized service, Andrew works directly with each client to understand their unique situation and fight for their rights.
