When a drug test is done using a hair follicle if the person has done drugs how long does it stay in

It will remain in hair as long as you have that hair. That is the point of using it. It gives a long term look at potential past drug use.

When a drug test is done using a hair follicle if the person has done drugs how long does it stay in the hair?

for a very long time they can tell what you have used for the past 20 years. the hair hold chemicals.

When a drug test is done using a hair follicle if the person has done drugs how long does it stay in the hair?

its either 6mos or a year either way its along time

When a drug test is done using a hair follicle if the person has done drugs how long does it stay in the hair?

should not matter

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When a drug test is done using a hair follicle if the person has done drugs how long does it stay in the hair?

until it grows out, your hair at your shoulders is 2 years old, hair grows at a quarter to half inch a month, but you can bleach your hair and it wont show cuz it kills everything, but if your a girl and not blonde you dont want to do that, but if your a boy you should just shave your head lol