Short answer: yes, it can. If you are tested for work or anything else, read this before you buy.

Why THCa can show up on a drug test

THCa turns into delta-9 THC when it is heated. That is the same delta-9 THC a drug test is built to catch. Smoking, vaping, or dabbing THCa flower or concentrates turns it into delta-9 THC.

The "less than 0.3% delta-9 THC" line on hemp products describes the product before it is heated. It does not mean the product cannot cause a positive test.

For more on how the two compare, read THCa vs THC.

What does a drug test look for?

Federal workplace drug tests, set by the U.S. Department of Health and Human Services, check for:

Test What it looks for Screen cutoff Confirm cutoff
Urine Delta-9 THC metabolite (delta-9-tetrahydrocannabinol-9-carboxylic acid) 50 ng/mL 15 ng/mL
Oral fluid (saliva) Delta-9 THC 4 ng/mL 2 ng/mL

The urine test looks for what delta-9 THC breaks down into. The test reports it as a "marijuana metabolite." It does not tell the lab whether the delta-9 THC came from hemp-derived THCa or anything else.

Private employers may use different tests or cutoffs.

Does "it was hemp" count as an excuse?

Not on federal tests. The U.S. Department of Transportation has said its Medical Review Officers will confirm a positive result even if a person says they only used a hemp product, and that CBD use is not a legitimate medical explanation for a confirmed positive.

How strong are THCa products?

THCa products are measured by THCa percentage. Our flower tests around 27% to 32% THCa and our concentrates around 75% to 95%. See What Is a Good THCa Percentage? for the full breakdown.

The bottom line

If you are drug tested, assume THCa products can cause a positive result. We cannot tell you how much, or for how long, because that depends on the person and the test.

Sources: U.S. Department of Health and Human Services, Mandatory Guidelines for Federal Workplace Drug Testing Programs, Authorized Testing Panels (Federal Register, March 13, 2026). U.S. Department of Transportation, Office of Drug and Alcohol Policy and Compliance, "CBD" Notice (February 18, 2020).

For adults 21 and over. This is general information, not legal or medical advice.

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