Watch Now

Truckers using cocaine more than marijuana, study finds

Mandatory hair testing needed to correct DOT underreporting, according to truckload carrier group

Hair testing study shows underreporting of hard drugs (Photo: Jim Allen/FreightWaves & Shutterstock)

A new study reveals that the U.S. Department of Transportation may be underreporting cocaine abuse by truck drivers, a finding that could put more pressure on federal regulators to allow hair testing as an alternative to urine testing for preemployment drug screening by trucking companies.

Because the Federal Motor Carrier Safety Administration’s Drug & Alcohol Clearinghouse does not allow hair test results to be included in the database, DOT “is seriously underreporting the actual use of harder drugs by truck drivers, such as cocaine and illegal opioids,” said Doug Voss, a professor of logistics and supply chain management at the University of Central Arkansas (UCA).

“Our analysis clearly concludes that hair testing identifies these harder drugs at higher percentages than the single urine testing method relied on by the federal government.”

Since FMCSA began publishing clearinghouse data in 2020, marijuana has far outranked other illegal drugs in positive test results, with cocaine and methamphetamines coming in a distant second and third, respectively.

However, 2020 data collected by UCA comparing preemployment urine and hair drug test results from major truckload carriers with urine tests in the federal clearinghouse found that an additional 58,910 drivers reporting into the federal clearinghouse would have failed preemployment drug tests had they submitted to hair testing.

The study found that cocaine and opioids were the most commonly identified substances in positive hair tests from the truckload carriers, with 16.2% more cocaine users and 14.34% more opioid users than were found in federal clearinghouse urine tests. “Utilizing statistical evidence, our analysis finds hair testing is more effective at detecting the use of harder drugs than urine testing,” the study noted.

The truckload carriers submitting data for the study — among them J.B. Hunt, Knight-Swift Transportation, US Xpress and Schneider National — are part of the Alliance for Driver Safety and Security, also known as the Trucking Alliance, which paid for the study. Trucking Alliance members all use hair testing as part of their own preemployment drug screening, even though the results are not legally permissible for use in the federal clearinghouse.

“Federal law prohibits truck drivers from using illegal drugs, yet thousands are escaping detection,” said Lane Kidd, managing director of the Trucking Alliance. “Drug-impaired truck drivers are a critical public safety issue, but employing these drivers can be a considerable liability risk.”

In September 2020 the U.S. Department of Health and Human Services released long-awaited proposed mandatory guidelines for the use of hair testing as an alternative to urine testing for preemployment and random testing of truck drivers.

Trucking Alliance (TA) urine vs. hair test comparisons.
(Source: UCA study, October 2021)

An HHS official stated in December that the agency is revising the proposal based on scientific data submitted during the proposal’s comment period. The final guidelines then must receive final departmental clearance followed by a review by the Office of Management and Budget.

Kidd asserted that until the federal government recognizes hair as a single test method, “employers should consider what Trucking Alliance carriers are doing and require driver applicants to pass the required urine test and also a hair test,” he said. “Driving a tractor trailer while under the influence is a lethal combination, and we must keep these drivers out of trucks until they complete rehabilitation and return to duty.”

Voss, who has conducted previous hair-test studies for the Trucking Alliance, told FreightWaves that he takes a “free-market view” on the issue.

“There are different carriers who have different risk profiles,” he said. “If you’re a larger carrier, I think you would be wise to use hair testing because you may not have the same ability to monitor your driver as closely as a smaller carrier. And smaller may not feel the need based on their risk factors. So there should be a choice — choose the testing methodology that best fits your risk profile.

As for the results of his study, “I think the safety implications are pretty straightforward,” he added. “You don’t want to have drivers on the road being allowed to drive a class 8 vehicle while using opioids and cocaine.”

FMCSA did not immediately respond when asked to comment on the study.

Click for more FreightWaves articles by John Gallagher.


  1. Dean

    They talk about supply shortages now. Can’t wait to see this become regular practice for employers and DOT drug testing. More truck drivers work 70 hour weeks than any other industry in the country. Ever take a long road trip where you leave at 5pm and drive till the next morning? That little window from 4am until sunrise where you start seeing double tail lights, shadows, driving a quarter mile at a time with your eyes shut hoping the rumble strips wake you up before you exit the road. Blasting the radio doesn’t work. Rolling down the window, singing, eating, nothing works until the horizon brightens and you get your 2nd wind. Now imagine doing that 6 days a week. 52 weeks a year. I will guarantee you that those 58,000 truckers at JB hunt, Snider, knight, swift use cocaine because they are safer staying awake and alert than sleeping at the wheel and don’t give me that pull off and get some rest. The industry is already in dire need of drivers that come Feb 7th will be harder and harder to recruit after new CDL rules begin. 58,000 drivers just in these few companies would have failed and lost their jobs. I’ll bet 1/2 will be unwilling to rehab in order to return to work. 58k. Now imagine a million, 2 million 3 million truckers all coming off the highway instantly because of hair testing. You think your toilet paper shortage was bad in 2019. Wait till your grocery stores have no food, no toiletries, no clothes, medicines etc. 80% of freight moves by truck. Take 20% away and now 80% needs moved but only 40% can be due to driver shortages. Within weeks cities will cannibalize themselves and the people who push for these rules will be begging the drivers they forced out to climb behind the wheel and get the country moving again. 23 year holder of a class A with an X endorsement from PA.

  2. Matt

    I failed a hair follicle test for marijuana and I haven’t used any drugs other then cigarettes in 13 years. my only exposure to marijuana was secondhand inhalation because several family members are medical users. Everyone including the lady that did the test told me the test couldn’t pick up second hand smoke. But it did and I was pulled off the truck and fired. I do not agree with using hair follicle tests.

  3. Joe

    You guys are snitching and ratting out drivers . Some of the truck drivers on vacation and if they want to party on hard drugs and let them they earn it on their vacation time. You guys are just helping the Big Tech companies to roll out their autopilot selfless driving trucks and don’t need truck drivers anymore.

  4. Julia

    I made over $700 per day using my computer in part time. I recently got my 5th paycheck of $19632 and all i was doing is to copy and paste work online. this home work makes me able to generate more cash daily easily. simple to do work and regular income from this are just superb. Here what i am doing.

    Try now…….🔥🔥🔥………. 𝐖𝐰𝐰.𝐏𝐀𝐘𝐂𝐀𝐒𝐇𝟏.𝐜𝐨𝐦

  5. Jason

    I don’t believe this BS, big fleets grasping at straws. Might be some drivers. But big fleets primarily recruit anyone with a pulse and usually the financially poor, usually are drug users or more likely to abuse them.
    Hence the reason mega fleets are such crappy employers for drivers. They take advantage and use and abuse them.
    Pay them peanuts and get government assistance to pay for their overpriced driver mills.

    1. Mary Carson

      Makes 💵$340 to 💵$680 per day online work and I received 💵$21894 in one month online acting from home. I am a daily student and work simply one to a pair of hours in my spare time. Everybody will do that job and online ask extra cash by simply
      copy and open this site .…………>> 𝗪𝘄𝘄.𝗡𝗘𝗧𝗖𝗔𝗦𝗛𝟭.𝗖𝗼𝗺

Comments are closed.

John Gallagher

Based in Washington, D.C., John specializes in regulation and legislation affecting all sectors of freight transportation. He has covered rail, trucking and maritime issues since 1993 for a variety of publications based in the U.S. and the U.K. John began business reporting in 1993 at Broadcasting & Cable Magazine. He graduated from Florida State University majoring in English and business.