On a September evening in 2014, a tractor-trailer going over 70 mph on an Oklahoma highway veered out of the left lane.

The truck driver was neither braking nor steering as the semi-truck crossed the median. That semi-truck traveled about 1100 feet before crashing into a bus on the other side of the highway.


NTSB investigates and determines causes of major transportation accidents in the U.S.

That bus was carrying about 15 softball players from a Texas college.

Four students were killed. Everyone else was injured, including both drivers.

Due to the severity of the crash and the number of fatalities, the National Transportation Safety Board (NTSB) conducted an independent and extensive crash investigation.

The initial report of the investigation was released in November 2015.


From the NTSB Highway Accident Report: Crash scene diagram showing location of roadway departure, point of impact, and final rest positions for truck-tractor and bus. Click image to see full NTSB report.


Driving under the influence of synthetic marijuana

“The truck driver’s lack of corrective actions following the roadway departure was due to incapacitation, likely from the use of synthetic cannabinoids”

–  NTSB report

Obviously, it’s very dangerous for a trucker to be driving an 80,000 lb. vehicle on a public highway under the influence of any drugs.

That’s why there are federal rules and laws that require companies to randomly drug-test employees with commercial drivers licenses—like truck drivers—for any of these drugs:

  • Marijuana
  • Cocaine
  • Opiates
  • Amphetamines and methamphetamines
  • Phencyclidine (PCP)

Truck drivers aren’t tested for synthetic marijuana.


Spice—and other versions of synthetic marijuana—were originally sold as “legal” alternatives to drugs banned under the Controlled Substances Act.

That doesn’t make it legal for truck drivers to use it.

Synthetic marijuana is considered an “impairing substance,” and regulated under the Controlled Substances Act.

There’s a big gap between drug-testing regulation, and the ban on the use of impairing substances while driving.

In this case, if the truck driver who caused multiple fatalities had been drug-tested by his employer, he would have passed.

This discrepancy was highlighted in the NTSB’s investigation into the crash.

Following the investigation, several recommendations were made to FMCSA and trucking carriers:

  1. Study the prevalence of trucker use of synthetic cannabinoids. Since the required random drug tests don’t check for these substances, there is no data on their use.
  2. Determine if and how to reduce the use. Would adding this to the standard drug test help?
  3. Address truck driver use of any impairing substances that aren’t being tested. Truckers have to avoid any substance that impairs cognition or reflexes—regardless of whether or not it is legal or illegal, tested or untested.

Four college students died. A dozen other people were hurt.

Hopefully, this tragedy will prompt the government and the trucking industry to fix the massive hole in truck driving drug testing.