Well cocaine can stay in the hair for a long period of time. This usually happens in patients who have been using the drug chronically but there have been reports of it being detected in one time users as well. The case reports state that cocaine has been detected for upto 90 days after a single use in some patients. Getting haircuts wont help mask the use in this situation as the drug is absorbed into the hair follicle itself. Now that being said there is a chance that it wont show up after a single use of the drug, it does depend on how much you have used, the higher the quantity the greater the chance that it might stay longer in your body. Secondly, it can leave you system quicker depending on your metabolism as well.
But usually the texts state that it can be detected for upto 90 days. So it is possible that you might not pass your hair test. Also, haircuts wont help as the hair test isnt done by cutting hair, its done by removing a hair follicle from its root and a hair cut doesnt get rid of cocaine in that area.
Unfortunately, there is no way to remove cocaine from your hair, if it is present there. And i wouldnt advise spending money on the removal systems which are advertised on the internet. They dont work. But there is a chance that you might pass the test as it usually doesnt stay this long in the hair (90 days) in patients who are not habitual users and have just used the drug on one instance.
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