zsmoker

I have been smoking for over 13 years almost once a week (on average), taking occasional one month breaks here and there. In the past 3 months I have smoked about 5 bowls in December, about 3-4 in January, the last being January 30. I bought a home drug test last week and submitted my leg hairs (which are about an inch long). My results came back negative.

I've read all over the place that body hair is used if head hair is unavailable. What I don't understand is that body hair length is finite. So how can THC get into body hair that is already at its fixed length? I'm assuming some sort of shedding takes place and any new hair that grows in its place would contain the THC. Is this correct? Also, why didn't I test positive in my leg hairs for THC??