Transportation
Spring 2025

The Challenges of Workplace Drug Testing in the Era of Marijuana Legalization

Workplace drug testing, particularly in the transportation industry, has been a critical tool for ensuring public safety. However, the practice which has been widely adopted for the past 36 years, faces significant challenges as societal attitudes toward marijuana shift and states pass laws legalizing or decriminalizing its recreational use. These regulatory changes, coupled with increasing rates of marijuana use among the workforce highlight the need to revisit and reinforce drug-testing policies to prioritize safety, particularly in industries where lives are at stake.

Recent data illustrates the growing prevalence of drug use in the workplace. The 2021 Drug Testing Index (DTI) revealed that the rate of positive drug tests among the U.S. workforce has reached its highest level since 2001, increasing by more than 30% from an all-time low in 2010. Marijuana positivity rates, in particular, have reached a 20-year high with the transportation industry seeing some of the largest increases. By June 2022, nearly 130,000 truck drivers were registered in the Drug and Alcohol Clearinghouse for violations, raising concerns about the implications for road safety.

The legalization of marijuana for recreational use in multiple states has brought about a 6.5% increase in vehicle injury crash rates, underscoring its impact on public safety. Despite shifting societal views that often portray marijuana as safer than alcohol, experts caution that its effects on cognitive function and motor skills are far from benign. Unlike alcohol, which has a well-documented window of impairment, marijuana can impair reaction times, memory, and other critical driving skills for extended periods. Moreover, the absence of reliable roadside testing methods to detect marijuana impairment further complicates enforcement efforts.

Employers in the transportation industry face unique challenges as they navigate the complexities of balancing public opinion with the necessity of maintaining safety standards. Some employers may consider leniency in marijuana testing, particularly in light of proposals such as the Drug Enforcement Administration’s (DEA) plan to reschedule marijuana from a Schedule I to a Schedule III drug. However, these decisions must be weighed against the significant safety risks associated with marijuana use, especially in roles where impaired performance could result in catastrophic consequences.

The National Transportation Safety Board (NTSB) has recently issued several recommendations aimed at mitigating the risks associated with drug-impaired driving. These include adding warning labels to cannabis products, enhancing state drug-impaired driving laws, and standardizing testing technology to detect drug use. The NTSB also advocates for the use of oral fluid collection for drug testing, modifications to laws allowing electronic warrants for obtaining biological specimens during impaired driving arrests, and further research on compliance with driving-related warnings. While these recommendations are critical, it remains uncertain whether federal or state agencies will implement them promptly.
In the interim, employers bear the responsibility of addressing these challenges. Organizations must establish clear policies on marijuana use, educate their workforce on its potential safety impacts, and foster a culture of accountability and safety. By doing so, employers can protect not only their workers but also the public from the risks associated with impaired performance in safety-sensitive professions.

As marijuana legalization continues to spread and societal attitudes evolve, the transportation industry and other safety-critical sectors must adapt. While the conversation around marijuana use is complex, the overarching priority should remain unchanged: safeguarding lives by maintaining the highest standards of workplace safety.

Written by Anna V. Cree, Esq.