several months: See http://www.Canorml.Org/healthfacts/drugtestguide/drugtestdetection.Html quoting from it:"one study found that 85% of daily users tested positive for marijuana, versus 52% of occasional smokers (1-5 times per week)...It is doubtful whether hair tests are sensitive to one-time use of marijuana." nothing takes it out. They usually test the hair closest to scalp which can show use in past 3 mos.
Answered 9/15/2017
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No, cutting hair or: Shampooing it won't cheat the test. Per' pharmacokinetics of cannabinoids' by mcgilveray ij. 'hair tests are more likely to detect regular than occasional marijuana use. One study found that 85% of daily users tested positive for marijuana, versus 52% of occasional smokers (1-5 times per week).' it can remain in follicle for months.
Answered 4/20/2018
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Drug deposits: Many drugs , particularly those that are fat soluble , can stay around and show up in drug testing for one month or longer.
Answered 7/16/2018
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90 days: Nothing can wash it out. Must ask yourself if you would rather use pot or work. The decision is fully yours.
Answered 10/11/2016
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