Some truck drivers use drugs while on the road, and federal data confirms it happens often enough that trucking regulators track it closely. At Fiore Legal, our attorneys have spent 25 years investigating California truck accidents, and impairment is one of the first issues we examine when a client is hit by a big rig or other commercial vehicle. Understanding why drivers use drugs, how it affects their driving, and what the law requires of trucking companies can help you build a stronger claim if you were hurt in a truck accident.
How Common Is Drug Use Among Truck Drivers?
Drug use among commercial truck drivers is tracked through the Federal Drug and Alcohol Clearinghouse, and the numbers show it is not rare.
Since the Clearinghouse became mandatory in January 2020, the Federal Motor Carrier Safety Administration (FMCSA) has recorded more than 6.2 million employer queries, each reflecting a driver's drug and alcohol testing history that had to be checked before they were allowed behind the wheel.
The substances most often found in positive tests include:
- Marijuana, which remains prohibited for CDL holders under federal law, regardless of state legalization
- Cocaine and amphetamines are often used to stay awake on overnight or long-haul routes
- Opioids, sometimes tied to pain management after a prior injury
- Methamphetamine is associated with extended-hours driving
Each of these substances carries its own risks behind the wheel, and combining them with the long hours common in trucking multiplies the danger to everyone else on the road.
Why Some Truck Drivers Use Drugs on the Road
Fatigue and pay pressure are the two most common reasons drivers turn to stimulants or other substances during long shifts. Several factors tend to drive this pattern:
- Many trucking companies pay by the mile rather than by the hour, which pushes drivers to stay on the road longer than is safe
- Younger, less experienced drivers are more likely to rely on substances to push through overnight routes, since they have not yet developed the routines that help veteran drivers manage fatigue safely
- Drivers at larger carriers often have better pay structures, more predictable schedules, and stronger oversight, which reduces the pressure to use drugs to meet delivery windows
- Drivers at smaller or medium-sized carriers may face less structured schedules and fewer resources for managing fatigue, which can increase the temptation to self-medicate
How Drug Use Affects a Truck Driver's Ability to Drive Safely
Impairment from drugs degrades the exact skills a truck driver needs most: attention, reaction time, and judgment. According to the Federal Highway Administration, federal weight standards allow a commercial truck's gross vehicle weight to reach 80,000 pounds, which makes any loss of control especially dangerous.
Different substances create different risks:
- Stimulants such as cocaine and amphetamines can cause hallucinations, vertigo, and impaired depth perception
- Marijuana slows reaction time and reduces concentration, and its effects can compound the fatigue a driver is already fighting on a long shift
- The danger is not limited to a single impaired trip: a driver who relies on substances to manage fatigue on one route is likely to repeat the pattern on future routes, making the risk to other motorists ongoing rather than a single lapse in judgment
Federal Drug Testing Requirements for Commercial Truck Drivers
Federal law requires CDL holders to be tested for drugs and alcohol at several points during their employment. Under 49 CFR Part 382, trucking companies must conduct pre-employment testing, random testing throughout the year, and post-accident testing after certain qualifying crashes.
The FMCSA Drug and Alcohol Clearinghouse requires employers to query a driver's testing history before allowing them to operate a commercial motor vehicle, and any violation, including a positive test or a refusal to test, must be reported to the Clearinghouse and follows the driver's CDL even if they change employers.
How Impairment Affects Liability After a Truck Accident
A positive drug test or a documented Clearinghouse violation can be powerful evidence in a truck accident claim. If a driver was impaired at the time of a crash, that evidence can support a claim not only against the driver but against the trucking company, particularly if the company failed to conduct required testing or ignored warning signs of a driver's substance use.
Under California Civil Jury Instruction (CACI) 426, Negligent Hiring, Supervision, or Retention of Employee, an employer can be held directly liable if it knew or should have known that hiring or retaining a driver created a particular risk to others.
Evidence commonly used to establish impairment includes:
- Post-accident toxicology results
- The driver's Clearinghouse record
- Hours-of-service logs
- The trucking company's internal testing and hiring records
Steps to Take If You Suspect a Truck Driver Was Impaired
If a truck driver hit you and you believe they were impaired, quick action helps preserve the evidence needed to prove it:
- Call 911 and request that law enforcement document the scene and any signs of impairment
- Seek medical treatment immediately, even if injuries seem minor at first
- Avoid discussing the accident with the trucking company's insurance adjuster before speaking with an attorney
- Contact an experienced truck accident attorney quickly, since post-accident toxicology results and driver logs can be lost or overwritten within days
How Fiore Legal Fights for Truck Accident Victims in California
Fiore Legal has represented California truck accident victims for 25 years, and our team knows how to obtain driver testing records, Clearinghouse violations, and carrier hiring files before they disappear. Our attorneys have secured significant results for clients across Los Angeles, the Inland Empire, and communities throughout California, and we handle every truck accident case on a contingency basis so injured victims never pay out of pocket to pursue justice.
Our team is ready to investigate your case and fight for the compensation you deserve. Contact us today to learn more about how we can help.
Disclaimer: The information on this page is provided for general educational purposes only and does not constitute legal advice. Every case is different. Past results do not guarantee future outcomes.
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