Answer

Dear XXXXX,

It should still show up in a hair test. You can also try sweat tests if you don't rely on the urine one. I found a website (It's designed to help people avoid drug detection tests.), and it says that drug use is present in the hair for several months after use. (It is in urine use that the results are 3 to five days afterward.). All of this information is listed on this site (urine, hair, sweat, etc./what tests work well and which don't.) if you wish to read it for yourself: http://cocaine.org/faq.html

The following is an excerpt relating to your question:

"2.5 Hair testing: When THC metabolites are in the blood, they go through
the blood vessels in the head, and get filtered through the hair. THC
metabolites remain in the hair as a permanent record. The hair test costs
several hundred dollars ($150-$300) and is rarely given because urinalysis
is cheaper (approximately $65) and more accurate. (The hair test equipment
and setup goes for over a million). According to Jeff Nightbyrd, hair
tests are "widely used in the casino industry." They cut 50 strands of
hair from the scalp, and send it in to the testing lab where they liquefy
it. "A hair sample is disolved in a series of solvents which extract the
drug metabolites and then are analyzed via GC/MS." It can take several
hours to days just to extract metabolites. Average hair grows 1/4 inch per
month. Typically they just use hair one and a half inches from the scalp;
though some labs will take enough to test for up to 3 years. The liquid is
run through the most sensitive GC/MS machines available, and can detect as
little as 1 ng/mL! The hair test discriminates in that detection is easier
in dark hair. Colored people may be discriminated against further because
melanin is in their hair, which can be mistaken for THC. However, there is
conflicting data as to whether melanin can be detected as THC.
Psychemedics Corporation has a PDT90 kit for $75. This home test kit is
for parents that want to chop off a lock of their child's hair to find out
what drugs s/he is using. Kids- lock your bedroom doors at night if your
parents don't trust your judgment on the drug issue.

    Beating the hair test is extremely hard, and there are false positives.
Bleaching or dying your hair is rumored to work, but it doesn't. I imagine
you can shave every hair on your body and claim that you're a swimmer.
According to NORML, Aloe Rid by Nexus is a shampoo that will aid in testing
negative. Aloe Rid is available only in salons. Healthy Hair, from Sampson
Health Products, is another shampoo designed to beat the hair test.
Healthy Hair is sold in retail stores throughout Las Vegas. Keith Thrash
from Sampson Health Products reccommends precleansing with Aloe Rid prior
to using Healthy Hair. Healthy Hair is used in the morning and before
going to bed. Each session takes 20 minutes. According to Steve at
Sampson Health Products, two out of a thousand people failed the hair test
when using Healthy Hair. Byrd Labs is currently developing a shampoo to
defeat the hair test. Some have suggested treating hair with oil because
THC is oil based and oil soluble. However, there is no proven way to beat
the hair test, so it's all heresay and guessing at this point. (If anyone
has any success with the shampoos or the swimmer excuse, please let me
know). Swimming and washing your hair removes toxins, and Keith Thrash
recommends doing both as much as possible. Fortunately, the hair test
cannot be used alone as evidence because there are no forensic standards.
It can only be used when substantiated by other evidence. Also, there are
no intoxication standards. I believe if you tested positive for the hair
test that you would probably have a good chance of fighting it.
(BlockBuster Video uses the most up-to-date equipment, and passing such a
test can be difficult). It takes several months of precleansing to beat
the tests given by Psychemedics."

I hope that this information helps you.

Mic Sayre