Hair test question

[Stosh]

I smoked one Join in July 2012 and or joint in May 2013. I have to take a hair follicle test in early November. I am bald so they will have to take body hair. Those were the only times I smoked since high school 29 years ago. I don't know how far the hair test goes back or even if one joint would show. What are my chances of passing? Thanks for your time!!

[Stosh]

Went and took my own. Passed with armpit hair. Body hair grows approx ,3mm per day so that equates going back approx 4 1/2-5 months