USDOT Clarifies Marijuana Rescheduling Will Not Change DOT Testing Rules

As federal agencies move forward with rescheduling marijuana under the Controlled Substances Act, confusion has grown across the transportation industry. Many drivers and employers have questioned whether a lower federal drug schedule would change DOT drug testing rules.

In December 2025, the U.S. Department of Transportation made its position clear. Marijuana remains prohibited for all DOT safety-sensitive employees regardless of any federal rescheduling action.

This clarification is critical for motor carriers, owner operators, and DOT-regulated employers preparing their 2026 compliance programs.

What Marijuana Rescheduling Means at the Federal Level

In 2024 and 2025, federal agencies began formal action to move marijuana from Schedule I to Schedule III under the Controlled Substances Act. While this change affects how marijuana is regulated for medical and research purposes, it does not change DOT safety regulations.

DOT drug and alcohol testing rules are governed by federal safety statutes and 49 CFR Parts 40 and 382. These regulations require that marijuana remain a prohibited substance for anyone performing safety-sensitive duties.

DOT regulatory authority under Part 40 is published here:
eCFR

FMCSA controlled substances testing requirements under Part 382 are published here:
eCFR

USDOT’s Official Clarification

In December 2025, USDOT publicly stated that marijuana rescheduling does not alter DOT testing rules. Drivers who test positive for THC remain in violation of federal safety regulations even if marijuana becomes Schedule III.

The Office of Drug and Alcohol Policy and Compliance maintain USDOT guidance on drug and alcohol testing authority. Transportation

This means that all DOT-regulated employers must continue to:

test for marijuana on all DOT drug panels
remove drivers from safety-sensitive duty after a positive THC result
Reporting violations to the FMCSA Drug and Alcohol Clearinghouse
requires completion of the return-to-duty process before drivers can return to work

Why State Marijuana Laws Do Not Override DOT Rules

State legalization does not override federal transportation safety laws. Even in states with recreational or medical marijuana programs, DOT-regulated drivers must remain THC-free while performing safety-sensitive functions.

QuickScreen previously explained how refusal and positive test results affect driver eligibility in
What Happens When an Employee Refuses a Drug Test?

Employers must comply with federal DOT standards, regardless of state law.

How Marijuana Policy Confusion Impacts Clearinghouse Records

Any positive THC test must be reported to the FMCSA Drug and Alcohol Clearinghouse. These violations can now directly impact CDL eligibility through state licensing agencies under Clearinghouse II rules.

Employers who want a full overview of how fentanyl and emerging drug risks may influence future panel changes can review DOT Seeks Input on Adding Fentanyl to Official Testing Panel

Clearinghouse requirements and enforcement authority are maintained here: Clearing House

What Employers Should Do in 2026

Employers should take proactive steps to prevent marijuana related violations:

Update DOT drug and alcohol policies to state that marijuana remains prohibited
Reinforce supervisor training on reasonable suspicion
Remind drivers that federal law overrides state legalization
Review Clearinghouse reporting procedures
Verify that all violations are being reported correctly

For a broader overview of current DOT testing rules and compliance expectations, see
Clearinghouse Compliance Deadlines Employers Must Meet Before January 2026

What This Means for Safety-Sensitive Operations

Marijuana rescheduling does not change DOT compliance requirements. Positive THC results remain in violations, and drivers must complete the full return to duty process before resuming safety-sensitive work.

Employers who allow policy confusion to weaken their programs about risk violations, Clearinghouse enforcement, and CDL suspensions.

Contact QuickScreen

QuickScreen supports DOT-regulated employers with policy development, Clearinghouse reporting, consortium enrollment, nationwide collection of site access, and MRO services.

For compliance guidance or program review, visit Quick Screen or contact our compliance team today.