Hair tests are the most difficult to pass and THC in the hair follicles will remain there until the blood is clean and the hair follicle that contains the THC metabolites grows long enough for the affected area to be cut out and removed.  When there is THC in the blood it flows into the inner cortex of the hair follicle.  There is blood flow into the hair but no blood flow out of the hair.  When you pull a strand of hair from your head you will see a little red dot at the root.  This is blood.  As the hair grows, the toxins travel along that path until it reaches the end of the hair and you cut it off.  It is like sedimentary rock.  You can see the layers of different types and time periods of the surface.

There is no liver or kidney function in the hair to remove toxins so they remain longer in the hair than they would in the blood, urine or saliva.  This is why many employers are turning to the hair follicle test because it can determine a longer period of usage in the person subjected to the test.  Your hair grows approximately one half inch per month so generally the sample removed from the head needs to be at least one and one half inches to reflect a ninety day time frame from which the subjects drug usage will be determined.

Using a quality detox shampoo will help you pass a hair follicle drug test.  You just need to follow all of the procedures to assure that you avoid detection.  Most detox shampoos are designed to give you up to an eight hour window where the chemicals in the detox shampoo will mask the metabolites in your hair so they don’t show up in the lab test.  After the hair sample is removed from the scalp then there will be no further blood flow into the hair and no more contamination to your hair.  The chemicals in the hair sample will continue to mask the toxins long after the hair is separated from your scalp.

Having to pass a hair follicle test is tough but not impossible.  Selecting the correct detox shampoo will guarantee successful results.