There's not anything you can do, and that's the point of the test.
THC byproducts remain in the hair for over 90 days. When they say the test is designed to detect THC, they are not assuming that people are being good citizens and will ignorantly walk in for that exam. They are assuming that people who use drugs, will think just like you are, and will try to find a way to avoid detection. That is why a urine test isn't used to test for THC anymore. Hair is the prefect sample, usually taken from the eye-brow, since people do not completely shave their eye-brows, it can literally tell a lot about your life over the past 2-5 years.
One of the things it will definitely tell is your exposure to THC.
The good news is, most people are only casual smokers. Your hair is not a perfect database. It doesn't disclose whether you smoked marijuana once, twice, or five times, and whether that was just hours apart, or days apart, or months apart. It also doesn't disclose if you smoked marijuana at all. Simply inhaling smoke from a bystander is enough to show up in the results.
The test tries to be fair. If the amount is so negligible that it is possible that the amount can be due to second-hand inhalation 30 days ago, then it'll show up in the results, but it'll be marked negative (or, passed). But, if the amount is so obvious that it is likely or probable that the amount is due to first-person inhalation 30 days ago, then it'll stand out in the results, and it'll be marked positive (or, failed).
When the hair grows, the THC will be embedded in the proteins and amino acids of the hair. The only true way to get rid of the THC would be to shave your hair off. Also it depends on how fast your hair grows, if their testing the follicle and your hair grows 2-3 inches in 3 months, you would be fine, but if its slow growing hair, you might have an issue.
The hair is not absolutely clean-if there's the smallest microscopic trace of drugs left on the hair after washing-it will cause a false positive because the true positive concentrations they're looking for are so low.
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My friend's brother avoided this by shaving all his body hair and bleaching his head hair a couple times, then redying it his normal color. He passed and apparently he does a lot of drugs.
i think you have a decent chance at passing but if you do fail don't be surprised.
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There's nothing you can do. They use hair specifically because it's pretty reliable even over a history of over 90 days (they just use 90 as an artificial cut-off). You might still pass if you only did it once, but I wouldn't make that assumption. Sorry.
Since you only smoked once, the concentration of thc will prbably be so small that it won't register on the test, don't worry, one or two tokes of a joint won't show after 2 and a half months.
You "don't do any drugs" but you "did smoke weed."
How should I put this...
You're screwed. Better hope they like your personality.
Well your probably going to fail.
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