CBD Users May Test Positive for Marijuana on Urine Drug Screen

A new study discounts the assumption that people who use hemp-derived products will test negative for delta-9-tetrahydrocannabinol (THC), the psychoactive ingredient in marijuana.

The small study found that THC was present in half of urine samples from individuals who had used cannabidiol (CBD) oil for a month.

“It is often assumed individuals using hemp-derived products will test negative for THC,” note Staci Gruber, PhD, of McLean Hospital and Harvard Medical School, Boston, Massachusetts, and colleagues.

“[Our] results indicate this may not be true, especially if assays are more sensitive than advertised, underscoring the potential for adverse consequences, including loss of employment and legal or treatment ramifications, despite the legality of hemp-derived products,” they write.

The study was published online November 4 in JAMA Psychiatry.

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