Answer:

It is possible to fail a drug test for marijuana based on THC in a hemp oil, hemp seed, or hemp seed extract -- the ingredient in many CBD oils and supplements. Unusually large amounts of hemp oil or hemp seed would normally be required to cause a positive drug test.

However, with hemp extracts, i.e., CBD oils, there is roughly a 10% chance of failing a drug test with low to moderate doses of CBD, and this will be influenced by individual variation in how THC is absorbed and metabolized. As dosage increases, the risk increases: one study found a 50% of testing positive with daily use of a moderately high dose of CBD. Note that some products contain very little THC and are, essentially, THC-free. For details, including the amounts of THC that ConsumerLab.com detected in specific products, see the What CL Found section of the CBD Oils & Hemp Extracts Review.

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