A member asked:

Thc hair follicle testing how long does it stay in your system .

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90 days: Hair follicle tests can detect cannabis use up to 90 days based on a 1.5 inch follicle sample. If the follicle length is shorter, the detection period will likely be shorter.

Answered 5/21/2016

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Dr. Heidi Fowler answered

Specializes in Psychiatry

Follicle testing: In “Pharmacokinetics of Cannabinoids” by McGilveray IJ it is stated “Hair tests are more likely to detect regular than occasional marijuana use. One study found that 85% of daily users tested positive for marijuana, versus 52% of occasional smokers (1-5 times per week). Marijuana regular use may be detected in hair for months. Single use might not be picked up in hair.

Answered 10/23/2019

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Related Questions

A member asked:

How much THC is detectable in a hair follicle drug test?

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