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A member asked:
Cannibinoids in hair, if cannibinoids stay positive in the blood for up to a year, won't a hair test be positive for the same length of time?
A doctor has provided 1 answer
Misinformed?: First drug testing is only accurate at standard concentrations. Second, marijuana testing is not positive up to a year. It can be sixty days, but then begins to fall off rapidly. If marijuana is freshly used at acute elevated levels in the blood then it will be found in hair tests from that day forward. It quickly diminishes below the concentration to be found in hair.
Answered 1/12/2015
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