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How Long Can Marijuana Be Detected In A Hair Testing After Last Use?

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Posted on Thu, 17 Nov 2016
Question: Hello


I will be taking a hair folli me test for a job..I have not smoked marijuana in almost 6 months. May 17th was last time i touched anything. Should I be worried about failing the test?
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Answered by Dr. Michelle Gibson James (22 minutes later)
Brief Answer:
normally up to 3 months

Detailed Answer:
HI, thanks for using healthcare magic


The hair test normally involve taking at least an inch and a half ( 1 1/2) of hair which allows for detection for approximately 3 months. The cannabis enters the hair via the blood vessels and sweat.

Since you last used 6 months ago, it is possible that nothing will be found

I hope this helps, feel free to ask any other questions
Note: For further guidance on mental health, Click here.

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
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Answered by
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Dr. Michelle Gibson James

General & Family Physician

Practicing since :2001

Answered : 16808 Questions

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How Long Can Marijuana Be Detected In A Hair Testing After Last Use?

Brief Answer: normally up to 3 months Detailed Answer: HI, thanks for using healthcare magic The hair test normally involve taking at least an inch and a half ( 1 1/2) of hair which allows for detection for approximately 3 months. The cannabis enters the hair via the blood vessels and sweat. Since you last used 6 months ago, it is possible that nothing will be found I hope this helps, feel free to ask any other questions