How long does it take for marijuana to show up in your hair?

Answer 1

"Hair testing is quite accurate and can go back 6 months or longer, showing any controlled substances used in a sort of timeline. As hair grows out, any drugs used are encased in the hair shaft, so the longer the hair, the longer back in the individual's drug history the lab can detect. Most legitimate testing facilities, however, only use hair within about 3-5 cm of the scalp, and discard the rest. This limits the detection history to about 90 days, depending upon the rate of growth of the individual's hair. Some people attempt to circumvent this through shaving their heads. In the absence of the required amount of hair on the scalp, body hair can be used as an acceptable substitute. Additionally, for pre-employment hair testing, the inability to obtain a sample may be grounds for not hiring the individual'.

Answer 2

It depends on a few factors. How long and how much did you use? When did you stop using? Do you exercise and how much you weigh? THC is stored in the fat cells of the body so if you weigh over 200 lbs and smoke all the time then it will take a long while for it to leave your system.

Answer 3

Depending on how much is tested, marijuana can be detected up to three years after smoking it.

Answer 4

it too becomes part of the hair and ussually the test go back about 90 days

Answer 5

there have been cases of up to three years. it basically depends on the person and how much they smoke..

Answer 6

It takes approximately 6--8 hrs. or more post-consumption for drug to be metabolized and excreted in urine. Detection time is : 2-5 days to 12 weeks

Answer 7

however long your hair is grown out since you have done the drug

Answer 8

my husband said three days. not positive.