cbd drug test calendar

Can you fail a drug test due to CBD?

After smoking 4 grams of CBD flower in 4 hours (that’s a lot), study participants in a 2019 medical study were drug tested using blood, saliva, and urine samples. Did CBD show up on the drug test? No. None of the participants failed the drug test from smoking CBD flower.

Drug tests screen for THC, not CBD.  Even though CBD and THC both come from cannabis plants, they are completely different substances with different scientific characteristics that will not cause false positives in accurate drug tests.

  • CBD is non-addictive, non-psychoactive, and federally legal
  • CBD is rarely screened for in drug tests.

However, due caution should be taken when using CBD products or CBD flower if you are going to be drug tested.  CBD may be extracted on the same equipment as high THC marijuana causing some possibility of THC cross-contamination that may show up in a drug test. With regard to a drug test after smoking CBD flower, the cannabinoid content (including trace amounts of THC) in CBD flower varies due to plant genetics and growing conditions. It is possible for CBD flower to have some detectable levels of THC in a drug test.

Let’s take a look at the study so you can get a full understanding of what to expect from a CBD flower drug test like the one conducted in this medical study.

  • What exactly are the results when chronic hemp smokers get drug tested?
  • Learn how your results might vary with oral fluid drug tests vs. blood drug tests vs. urine drug tests.

If you don’t find the specific answer to your question, leave us a comment below. We’ll search the published studies to see if an answer exists and get back to you.

Let’s get started.

This guide is based on an authoritative 2019 medical study published in the journal of Clinical Chemistry and Laboratory Medicine.

nih cannabidiol study

Published April 8, 2019

Types of Drug Tests Administered

After smoking 4 (one-gram joints of high CBD hemp containing 0.16% THC) within four hours, individuals were drug tested  using three types of tests:

  • saliva
  • blood
  • urine

Drug Test Results

None of the participants in the study failed and of the drug tests applied.

  • None of the drug tests returned a positive result for THC.
  • None of the test results exceeded 1/5 of the minimum level of THC required to cause a positive drug test. (1)

Type of CBD Consumed Before Drug Test

This research was conducted on “light cannabis.” Light cannabis is popular in Europe. It has a cannabinoid profile similar to CBD hemp sold in the United States.

  • Light cannabis does not exceed 0.2 THC content but CBD content is higher and varies.
  • Light cannabis is a similar product to high CBD hemp strains grown in the U.S.
  • The cannabis cigarettes tested had a THC level of 0.16% THC and 5.8% CBD content. (2)

drug test studycannabidiol hemp test

Drug Testing Methods

12 participants were drug tested.  Each participant received a saliva test, a blood test, and a urine test for marijuana (THC).

Of the 12 participants, 6 individuals were drug tested after smoking only one cannabis cigarette. Each cannabis cigarette contained 1 gram total of light cannabis with 0.16% THC content and 5.8% CBD content.

The second group of 6 individuals was drug tested after each individual smoked 4 cannabis cigarettes within a 4 hour period. Each cannabis cigarette in this group was 1 gram in total with the same 0.16% THC and 5.8% CBD content as the first group. (3)

Sample collections from either group began a half-hour after the last CBD joint was smoked.

Blood Drug Test Results

The highest THC readings for either test group were found in the blood samples. The test results from the blood samples significantly below the minimum threshold for a positive drug test result. (4)

drug test studycbd drug test

Urine Drug Test Results

For either test group, THC urine concentrations peaked 8 hours after the last cannabis joint was smoked.  THC levels were significantly lower than the minimum threshold for a positive drug test result. (5)

Saliva Drug Test Results

The researchers concluded that saliva drug testing had similar results to the blood drug testing method. The saliva drug test results showed slightly less THC and CBD than were detectable by the blood drug test. (6)

hemp drug test

Download The CBD Research

Video: Hemp Drug Test Results


Keywords: blood; light cannabis; oral fluid; urine; variable cannabidiol (CBD); Δ9-tetrahydrocannabinol (THC)

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