What Employers Should Know About DOT Oral Fluid Testing Rules

The U.S. Department of Transportation (DOT) continues modernizing its approach to drug and alcohol testing, recently introducing regulatory updates that permit oral fluid drug testing as an alternative to traditional urine-based methods. While this marks an evolution in the testing protocol, understanding the current limitations, implementation barriers, and compliance responsibilities is essential for employers preparing for the shift.

Why Oral Fluid Testing?

Urine testing has been the standard for DOT-mandated drug screenings, but oral fluid testing introduces a faster, more observable collection method with several benefits. Oral fluid testing detects recent drug use more accurately, offering a detection window of approximately 24 to 48 hours. This makes it particularly effective for post-accident or reasonable suspicion testing—scenarios in which employers need real-time insight into an employee's fitness for duty.

Because oral fluid collections occur under direct observation, the risk of sample tampering is significantly reduced—an ongoing concern with urine testing. This testing method also improves privacy and inclusion, especially for transgender and non-binary individuals, by eliminating gender-specific observed collections.

Why It's Not Yet Active

Although the DOT's final rule allowing oral fluid testing went into effect on December 5, 2024, implementation is still pending. Employers can technically choose between urine and oral fluid testing. Still, they cannot begin using oral fluid testing for DOT-regulated programs until at least two laboratories are certified under the Department of Health and Human Services (HHS) guidelines.

While both HHS and DOT have approved oral fluid testing, no U.S. laboratory has yet been certified under the National Laboratory Certification Program (NLCP) to conduct this testing. Additionally, a complete testing device must receive FDA clearance for ten analytes, but so far, only three analytes have been cleared. Seven more remain in progress, and fentanyl is expected to be included as an additional target.

A Canadian lab has applied for certification, and if it and a second Canadian lab receive approval, DOT oral fluid testing could technically begin without FDA clearance. However, due to jurisdictional restrictions, FAA-regulated employers would still be limited to U.S.-based labs.

Collector Training and Qualifications

One of the most significant updates for employers involves collector training. A collector qualified to perform urine collections under 49 CFR § 40.33 is not automatically qualified to perform oral fluid testing. Employers must ensure that collectors receive training aligned with 49 CFR § 40.35, which outlines specific procedural and documentation requirements for oral fluid testing.

To ease the transition, the DOT has introduced temporary training measures. For one year following the certification of the first HHS-approved lab(s), individuals with less than a year of oral fluid collection experience may supervise mock collections, provided they've completed a "train-the-trainer" course or have actively trained other collectors. Additional procedural updates include requiring collectors to mark the "Volume Indicator(s) Observed" checkbox on Step 2 of the Federal Custody and Control Form (CCF), confirming that enough oral fluid was collected. The testing area must also remain secure and limited only to the collector, the employee, and an authorized DOT representative.

Preparing Your Workplace

Although oral fluid testing isn't active for DOT-regulated programs yet, this period offers a critical window for preparation. Employers should review and revise their workplace drug and alcohol testing policies to include oral fluid testing protocols. This includes planning for collector training, procedural adjustments, and chain-of-custody documentation updates.

How DISA Can Help

As regulations evolve, DISA Global Solutions is ready to help employers navigate the complexities of DOT compliance with confidence. Our industry-leading experts have the knowledge and guidance to update your testing policies and train staff for oral fluid collection protocols. Once oral fluid testing becomes available, we’ll ensure you’re fully equipped with the tools, training, and resources to implement it effectively. With our decades of experience in the compliance and safety space, we’re here to help you maintain a safer, more compliant workplace.