If you have marijuana in your hair the simplest solution would be shower, if you're talking about drug testing keep reading...
If you haven't smoked recently it should be gone with 2-3 days. Constant users are detectable up to several weeks, longer than any other illegal substance is detectable.
Your best defense:
1) Shave your head. No hair, no marijuana!
2) Switch to harder drugs.
3) Wear a wig made of REAL HUMAN HAIR. Nothing fake or polyester, those tests sample the pH and they'll know something fishy is going on when they find out that they have a sample of your cat's/ferret's/barbie doll's hair.
Get a very good Lice removing treatment (shampoo, kits, etc). Make sure you thoroughly wash your hair with it. Depending on how long you have to remove the substance from your hair, you might want to consider buying a Toxin hair removal kit. For example, there is a store in my town called Yo Yo Dyne, and they sell all sorts of detox to remove marijuana from your system ASAP. Another option to consider is dying your hair. Bleaching definitely works but if you have dark hair you can go a shade darker and it will still work. There is a way around everything.
You can't unfortunately.
Drinking sperm has been clinically proven to remove THC from ones hair and urine.
There is no specific shampoo that can remove THC (the psychoactive component in marijuana) from your hair. THC gets deposited in hair follicles and can be detected for a long time. The best way to avoid THC detection in hair is to refrain from using marijuana.
There are no reliable methods to quickly remove marijuana from hair follicles. The best approach would be to wait for your hair to grow out and for the marijuana metabolites to naturally fade over time. Additionally, using detox shampoos or consulting a healthcare professional for advice may help in the process.
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.
From smoking it.
No, exposure to the smoke of marijuana does not stay in the hair forever, but duration does depend on the frequency and severity of exposure and frequency of washing hair. What does happen though is, if a person smokes marijuana there are traces of it that reaches the follicles and grows into the hair. A hair sample can be taken from the person and tested and can prove that he/she smoked marijuana.
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.
If you have chunks of marijuana in your hair, pick it out or comb it out. If you have the smell of marijuana in your hair, use shampoo. If your hair will be used to scientifically test for marijuana useage, and you have used marijuana, cut off your hair. Most likely if you're bald they'll ask for hair from another part of the body. If you're completely bald they might not give you a job. The only thing that can save you is to shave your head and get a wig that looks real and is made from human hair. But that would take a lot of work.
no
no
No.