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A member asked:
Tetrahydrocanabinol what causes for false negative and false positive?
A doctor has provided 1 answer
Great question: I think dilute urine is the most likely source for false negatives. I am not familiar with other substances outside of the cannabinoid class of compounds (some of the newer synthetics?) that will react with standard immunoassays. If one is concerned, however, about a false positive there is confirmatory testing that can determine for sure whether it was a false positive or not.
Answered 10/20/2019
5.3k views
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