DOT says "Yes" to Oral Fluid Testing. HHS Said "Hold On." Here's Where Things Stand.

If you've been following drug testing news in the transportation and trucking world, you've probably seen some version of this headline: "DOT Approves Oral Fluid Testing as Alternative to Urine." And technically, that's true. What those headlines often bury in paragraph seven is the part that actually matters to you as an employer right now: you still can't use it.

Here's the situation in plain English.

What DOT Actually Did

On May 2, 2023, the U.S. Department of Transportation announced it would officially authorize employers to use oral fluid testing as an alternate methodology to traditional urine drug testing. This policy change went into effect June 1, 2023. The industry celebrated. Trucking associations had been pushing for this for years — and for good reason. DOT noted that oral fluid testing "will give employers a choice that will help combat employee cheating on urine drug tests and provide a less intrusive means of achieving the safety goals" of the department's drug and alcohol testing program.

Sounds great. So what's the holdup?

The Part Nobody Warned You About

Here's where federal bureaucracy gets creative. DOT can authorize a testing method all day long, but before any DOT-regulated employer can actually implement oral fluid testing, the Department of Health and Human Services has to certify at least two laboratories — one to run the primary test and one to process the split specimen if the result is challenged.

As of April 2026, there are no laboratories certified to conduct drug and specimen validity tests on oral fluid specimens. Zero. The current status: authorized on paper, but factually impossible to perform.

This isn't a small administrative gap. It means that regardless of what you've read, regardless of what a vendor may have told you, and regardless of how appealing a cheek swab sounds compared to a urine collection — if your workforce is DOT-regulated, oral fluid testing is not an option today.

Why Does This Matter to You?

Because I talk to employers regularly who are making — or planning to make — compliance decisions based on incomplete information. If you're in trucking, aviation, rail, or transit, your drug testing program is governed by DOT's Part 40 regulations. Until oral fluid testing is legally usable for DOT-regulated testing, you're still bound by the urine testing procedures in Part 40. That means urine collection, chain of custody, HHS-certified labs, and all the rest of it. Nothing has changed on the ground, even if it has changed on paper.

Acting on the "approved" status before the lab infrastructure exists isn't just premature — it's a compliance failure waiting to happen.

What's Coming — Eventually

Labs are working through the certification process. To become certified, an applicant laboratory must undergo three rounds of performance testing plus an on-site inspection. Quest Diagnostics and LabCorp are among those that have publicly announced they are seeking certification, and both are well-regarded in the industry. But as of right now, neither has crossed the finish line.

During the initial rollout of oral fluid testing, DOT allowed employers to use non-qualified personnel to monitor mock collections — but that flexibility ends one year after the first oral fluid lab is certified by HHS. So when the green light finally does come, there will be a training and preparation component employers will need to address quickly.

The Bottom Line

Oral fluid testing has real advantages — it's observed, it's harder to cheat, and it correlates more directly to recent use. When the lab certification piece finally falls into place, it will be worth evaluating for your program. But "worth evaluating someday" and "compliant today" are two very different things.

If you have questions about what your DOT-regulated drug testing program actually requires right now — or if you want a second set of eyes on your current process — that's exactly what we're here for.