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Will Smoking Hemp Flowers Make You Fail A Drug Test?

Drug test
Written by Jack Woodhouse

They look, smell, and smoke just like regular cannabis. Yet CBD-rich hemp flowers don’t get you ‘high’. But is there any chance that smoking hemp flowers can make you fail a drug test?

The short answer is that is it’s very unlikely. However, there are a few things you can do to make sure you’re limiting your chances of testing positive after smoking hemp flowers.

But first, what exactly are CBD hemp buds?

Best CBD Flowers - from the 'CBD Flowers Weekly' newsletter

Best CBD Flowers – from the ‘CBD Flowers Weekly’ newsletter

Hemp is a variety of cannabis that is traditionally grown for industrial purposes. Cannabis has an exceedingly strong fibre that makes an extremely versatile material. Hemp also has low levels of THC – the compound in cannabis that causes the mind-altering effects commonly associated with cannabis use.

The levels of THC in hemp is dictated by the authorities. There is a 0.3% limit in the U.S and a 0.2% limit in much of Europe. There is, however, no limits to the amount of CBD hemp can contain.

Therefore, following the huge increase in demand for CBD over recent years, some hemp farmers have turned to cultivating hemp with very high levels of CBD and very little THC to process into various CBD-containing products. One of the most popular is the dried flower of the plant itself, which, when cured and trimmed properly, strongly resembles regular high-THC cannabis.

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What do drug tests look for?

Best high-CBD hemp flowers

Best high-CBD hemp flowers

Most drug tests are looking for THC, not CBD. This means that consuming CBD will not cause a positive test result. Hemp buds can contain a small amount of THC, though. There is, therefore, a slight risk to testing positive for THC on a test.

Before you get too concerned, however, please be aware that you would have to consume a very large amount of hemp buds in order to test positive for THC. Additionally, for most drug tests you have to have at least 50 ng/mL of a THC metabolite in your blood to test positive.  

Therefore, there is very little chance of testing positive for THC after smoking hemp flowers. To be on the safe side, always check the THC content of any CBD product, If possible, request to see third-party lab results of the products you buy.   

We have managed to secure the best high-CBD hemp flowers to the subscribers of the CBD Flowers Weekly newsletter. Subscribe and get weekly product reviews, news, tips, exclusive deals and limited-time offers. We will also send you our list of the best CBD flowers.

To verify, we have asked CBD Testers’s medical Adviser, Dr. Leah Zachar if vaping high-CBD hemp flowers can cause you to fail a drug test?

This is Dr. Zachars’ answer:

When the law enforcement or an employer performs an initial urine drug screen to check for “marijuana” the lab is checking for THC, not CBD.

In the rare cases, when this initial urine drug screen is positive at the > 50 ng/mL level, then by law, a secondary (confirmatory) urine drug evaluation must be done, called the GC/MS (Gas Chromatography/Mass Spectrometry) test.

The GC/MS secondary (confirmatory) urine drug evaluation for THC has no cross-reactivity to other cannabinoids that lack psychoactivity, such as CBD (cannabidiol), CBG (cannabigerol), and CBN (cannabinol).  It checks the urine exclusively for the delta 9-THC metabolite.

Put simply, as long as you use a high-quality, fully vetted CBD product, you can certainly vape CBD hemp flowers and easily pass a urine drug evaluation.

(Dr. Leah Zachar)

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About the author

Jack Woodhouse


  • not true, i smoked hemp with 0.26% thc about 8 grams per week and fail a drug test after 2 weeks of not smoking

    • Well said!! I have not smoked any hemp flower since this 6th of this month and I still can’t pass a at home test!! THIS STUFF WILL MAKE YOU FAIL A DRUG TEST!! If you have to be tested STAY AWAY from hemp flower!!!!

      • I love it! It’s real bud just all CBG and CBS and more. Just a little THC but so what just drink water you will be fine. But feels so good the Aurora and all and the smell of those tasty turpentines, yummy yummy.

        • It’s awesome also because you can get an ounce of good flower at an affordable price. Even for like 40 bucks is good, but there’s cheaper and better also. Its great

    • Same here bro! I’m smoke about 7 grams a week and my drug tests are coming back the same as when I was smoking the real deal! I’m trying to find out if it builds up in your system or if it’s the type of test they are using! Their lab is using a mass spectrometer to test and it’s coming back at 99 NG/ML which is a failed drug test based on their 50 NG/ML minimum! I hate being penalized for smoking something that is legal in all 50 states! If anyone has an answer to why we are failing tests for THC please help!

  • I take federal UAs, and I thought smoking industrial hemp flowers would be ok. It’s not. I came up dirty after smoking 3 grams in 1 week, and got in trouble. Still dirty, as I write this. Havent smoked in 2 days.

    • Just bring the bottle and receipt and be like this is legal and that should be an excuse because it’s no harm, its medicine.

  • I believe I know what the issue is with smoking the flowers (as someone that runs a vape shop and sells them and has had customers end up with failed tests, and as a consumer of this myself to avoid failing drug tests with my doctor’s office). The plant material contains THCA (thc acid) which is converted to THC upon being heated. This THC is then ingested by inhalation and the body converts it to delta-9-THC (the psychoactive component of cannabis). Once the delta-9-THC is passed into the liver, it is metabolized into COOH-THC (carboxy-thc). COOH-THC is what LabCorp tests for in the urinalysis for THC, they are testing specifically for this long-lasting metabolite instead of delta-9-THC or even plain THC itself. This is all from the THCA that is in the plant material itself, even though it is in relatively small quantities. I have yet to sit down with my wholesale representative that I get the flower from but this is my theory and I will update if I get any further information.

  • I take UAs for the federal government, and when I started smoking CBD industrial hemp flowers, I came up dirty. Sad fact. Wish I didnt. But this is a fact, if you smoke the flower of industrial hemp, you will pop dirty.

  • I really like the flowers. The flowers after smoking them last night took almost all the pressure of my brain and I feel so much better. My pituitary gland shrunk and I feel excellent on my my. I filled the bowl twice already. Excellent.

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