Is there a correlation between hair length and hair drug testing results?!

Is there a correlation between hair length and hair drug testing results?

My friend has a hair drug test and she says that when he will take the test, he will have been clean for aprox. 2 1/2 months. He smoked marijuana for 2 weeks a month ago and has a hair drug test in a month and a half. He says when he goes in to take the drug test, he is going to shave every part of his body and leave about a half an inch to and inch of hair on his head for them to sample. Do you think he is in the clear or should he have reason to worry? Personally I think he will be clean because before then he said he hadn't smoked until Feb. 2007. However, I'm not an expert. He is very athletic and workouts daily. He has very low body fat. Any information will help. Thank you.

first off, kevin57 is absolutely wrong!! The length of your hair DOES matter when getting a hair test. Most facilities only test back 3 months and since the average person's hair grows about 1/2 inch a month that correlates to them testing only the first 1 & 1/2 inches of hair from the scalp. When drugs enter your system they go into your bloodstream which then goes into the hair follicle. Any drug use shows up in the hair shaft only at the particular point when drugs were used. i.e., if you used 2 months ago the drug metabolites would show up in your hair shaft about 1 inch from your scalp (it's kind of like the rings of a tree trunk.)Therefore they can only test as far back as his hair is long. If he only has about 1 inch of hair at the time of testing then the test will only go back 2 months. Also, these are approximations; some people's hair grows faster or slower than that.My suggestion is to cut his hair very short right before testing and also shave any other viable testing hair on the body.(facial, leg, underarms, pubic, etc.) It is unlikely that if he has about an inch of hair on his head they will ask for hair elsewhere but shave anyway just to be safe.I think he should test clean if he really hasn't used for 2 1/2 months at time of test. and he cuts hair, it should be fine.

P.S. fitness has nothing to do with hair test results. If the drugs were in his system they will show in hair regardless of how fit you are.