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A member asked:
Cannibinoids stay positive in blood up to a year. since this is the blood feeding the hair, won't the hair continue to be positive as it grows?
A doctor has provided 1 answer
Not true- 2 weeks!: I don't know what makes you think cannabinoids stay positive in blood up to a year- they tend to stay positive for 2-3 days after use, though up to 2 weeks in frequent/heavy users. Hair tests can be positive for about 90 days after use. See http://en.Wikipedia.Org/wiki/cannabis_drug_testing.
Answered 9/29/2016
4.6k views
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