It depends on the drug being tested. Marijuana used only once can be tested for up to three years. Other drugs don't even appear in hair follicle samples. And certain drugs are passed through the system untracable within 48 hours. Some drugs can only be tested conducting a spinal tap.
Is one time drug use detectable in hair test?
Only for 6 months.
Is one time drug use detectable in hair test?
yes. I think for at least 90 days, sorry no backup on this one.
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