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A member asked:

Would i pass a thc hair follicle test if i smoked marijuana once. it was once in july and i won't have the test until at least the end of october?

A doctor has provided 1 answer

Possibly no: The hair follicle test is standardized to collect a specimen dating back about 90 days. Depending on how fast your hair grows, you could possibly test negative if a specimen close to the scalp is obtained.

Dr Rothstein agreed

Answered 7/26/2018

3.7k views

Thank

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