Can a single half-assed hit of marijuana from a blunt a month ago show up in a hair follicle drug test?

Question by glace46: Can a single half-assed hit of marijuana from a blunt a month ago show up in a hair follicle drug test?
When I heard that I had to take a hair drug test for my new job, I wasn’t worried because I thought it was a urine test. But when I showed up there, BOOM hair test. I read online that a “single use” can be detected. However, nobody said anything about a single blunt hit where 1/5th the smoke of a regular blunt hit came out. I also get second hand exposure from time to time because all my friends smoke. I have black 2.5 inch long hair. I only smoked twice in my life and I never plan on doing it again. It would be a real shame for someone like me not to get the job when 95% of the country has smoked more than me.
I read that the cut off level for detection of THC is 1 pg/mg. So what I’m trying to ask is if 1/5th of a blunt hit + occasional 2nd hand exposure above or below that cut off level.

Best answer:

Answer by MrMD
If you shower daily and use shampoo like the average american it is not impossible but highly highly unlikely for it to be detected.

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