Simple.... DON'T do drugs - period !
gray hair has no melanin. melanin is waht cocaine and other synthetic drug metbolytes bond to. marijuana bonds to keratin. so if you are a moderate coke user you may be able to beat a hair test. if you smoke pot, you are screwed.
if you're talking about a hair strand drug test, my understanding is that marijuana can be detected in the strands of your hair for about a year.
If you did not smoke any marijuana, and you have since washed your hair, you will have no marijuana in or on any of the strains of hair on your head, and it will not show up on any drug tests.
Yes
yes, I just went in for my preemployment drug screening and they administered both a urine and hair follicle test
By shaving her head.
No. The drug is in your fat and hair cells. Don’t use if you want a clean test.
It's permanent. That's why Britney Spears shaved her head right before her drug test.
If it was inhaled, yes. That even means second-hand inhalation.
What if you smoke marijuana a month ago but you only smoke one time would it show up on your hair drug test
Only if you hadn't used in days. It will take 30 days if not, you will come out positive.
There is nothing you can do to get the drug metabolites out of your hair once it grows out other than cutting your hair, so if used in the last 3 months, is usually how long they go back for testing purposes.