I failed a drug test for a government job but I don’t take drugs?

WinCx3d
I failed a drug test a few days ago and they told me that i failed for Cocaine usage. My hair follicles picked up Cocaine usage … i don’t do any type of drugs and i haven’t dyed my hair … what could have caused me to fail?
I failed a drug test for a government job but I don’t take drugs?
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