DOT Maintained Marijuana Testing Rules After Rescheduling
Federal transportation officials confirmed that workplace drug testing mandates remain unchanged despite DEA rescheduling.
Updated on Sept. 28, 2026 in Substance Abuse
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The U.S. Department of Transportation has clarified that federal marijuana rescheduling does not eliminate workplace drug-testing requirements for safety-sensitive employees. A positive marijuana test remains a violation of federal rules regardless of state-level medical or recreational legalization.
Why it matters
The agency maintains authority to test for substances that pose safety risks, noting that state-dispensed marijuana still lacks FDA approval. Because marijuana remains a controlled substance under federal law, it cannot be verified as a legitimate medical explanation for a positive result.
The Department of Transportation oversees drug-testing requirements for 6.5 million safety-sensitive employees. These protocols continue to mandate testing for controlled substances despite the DEA moving specific marijuana products to Schedule III.
The players
Department of Transportation
This federal agency is responsible for the planning and coordination of national transportation infrastructure and safety regulations.
Drug Enforcement Administration
This federal law enforcement agency is tasked with combating drug smuggling and use within the United States.
Federal Motor Carrier Safety Administration
This agency operates under the Department of Transportation to reduce crashes, injuries, and fatalities involving large trucks and buses.
The details
Under the Omnibus Transportation Employee Testing Act of 1991, the agency retains its authority to prohibit marijuana use for transportation workers. Medical Review Officers are strictly prohibited from verifying a positive test as negative based on state medical documentation, as the substance is not recognized as a valid prescription under federal law.
Timeline
The Omnibus Transportation Employee Testing Act of 1991 established the framework for federal safety testing.
President Trump signed an Executive Order regarding rescheduling in December 2025.
Specific marijuana products moved to Schedule III on April 28, 2026, per a DEA final rule.
Formal hearings regarding broader rescheduling occurred between June 29, 2026, and July 15, 2026.
The Big Picture
The agency continues to apply the Omnibus Transportation Employee Testing Act of 1991 to maintain regulatory oversight in the face of evolving drug scheduling. This stance underscores the persistent gap between federal workplace safety standards and state-level legalization trends.
Employees in safety-sensitive roles must continue to comply with federal drug-testing prohibitions regardless of their state of residence. A positive test result carries significant professional consequences, as state-level medical marijuana authorizations provide no legal protection from these federal mandates.
The takeaway
Even with shifts in federal drug scheduling, transportation employees remain bound by strict safety standards that override state-level marijuana laws. Safety-sensitive workers should prioritize federal compliance to maintain their professional certifications and job security.
Further reading
For more context on federal policy, visit the Substance Abuse section.
Source note: This article includes information reported by Forbes.
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