HealthCareMagic is now Ask A Doctor - 24x7 | https://www.askadoctor24x7.com

question-icon

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

default
Posted on Thu, 17 Nov 2016
Question: Hello

I will be taking a hair follicle test today for a job..only drug I've ever used is pot..I have not smoked since may 17 almost 6 months ago. should I be worried about failing?
doctor
Answered by Dr. Dr. Matt Wachsman (18 minutes later)
Brief Answer:
YES

Detailed Answer:
The detection is on the basis of when the hair was at when you smoked. My hair is chemically stimulated to grow fast... ONE inch a month, most people's hair grows slower. So, if I used pot ONE month ago, the hair at ONE inch out would be positive. In you, that would be 2 to 6 inches from the skull and if you show up with a bald head they are going to fail you. They are likely to find pot at 2 to 6 inches out from the skull. There is no way to make it NOT show. There are easy ways to make it be falsely positive (shampoo in pot).
Note: For further guidance on mental health, Click here.

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
doctor
Answered by
Dr.
Dr. Dr. Matt Wachsman

Addiction Medicine Specialist

Practicing since :1985

Answered : 4214 Questions

premium_optimized

The User accepted the expert's answer

Share on

Get personalised answers from verified doctor in minutes across 80+ specialties

159 Doctors Online

By proceeding, I accept the Terms and Conditions

HCM Blog Instant Access to Doctors
HCM Blog Questions Answered
HCM Blog Satisfaction
How Long Can Marijuana Be Detected In A Hair Testing After Last Use?

Brief Answer: YES Detailed Answer: The detection is on the basis of when the hair was at when you smoked. My hair is chemically stimulated to grow fast... ONE inch a month, most people's hair grows slower. So, if I used pot ONE month ago, the hair at ONE inch out would be positive. In you, that would be 2 to 6 inches from the skull and if you show up with a bald head they are going to fail you. They are likely to find pot at 2 to 6 inches out from the skull. There is no way to make it NOT show. There are easy ways to make it be falsely positive (shampoo in pot).