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
Dr. Randy Baker answered

Specializes in Holistic Medicine

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

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