It depends on how far back they go on the hair follicle test, most places only go back about 90 days, but I have known of some going back almost a year. There are shampoos you can buy to wash your hair with and pass a test and also a product called blue will clean your hair, blood,saliva, and urine
Maybe. The hair follicle test will go back about 90 days. So four months in you may be okay. I would do some research. Just go to ask.com and type in "how long does a hair follicle test go back" that's what I just did. Lots of stuff came up. :)
The answer is NO even if you shave your head the oils in the scalp secrete the thc for months
Hair follicle testing goes back 90 days. If you haven't used in 4 months, and the test only goes back 3 months, you will be clean.