This is Dr. David
a one time use of cocaine 3 months ago most likely will not show up on hair follicle testing
if you hang around with people who use cocaine frequently or in areas where there is cocaine use, you could get false positive contamination of your hair and clothing which can turn your hair test positive.
but if you don't do this, then one time use most likely will not show up on hair testing.
let me know if you have other questions.
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