re: -

i took a hair test a few months ago and can answer your questions.

First off, my head is shaved down to a #1 and I'm not a hairy guy.

They need a cotton ball size sample for the lab, regardless of where the hair is from.

Instead of shaving bald spots in my head, the dude asked me if I wanted to submit hair from either my legs, arms, or arm pits. (they cannot take pubic hair)

I shave my chest and my arms are pretty thin, so I opted for the leg hair because obviously I didn't want the dude to shave my pits. They shaved both of my legs from ankle to knee with a conventional razor and it was still barely enough of a sample to submit.

In most cases when they take long head hairs, it goes back 90 days because they take an inch and a half of hair. Each half inch is 30 days, hence the 90. Body hair grows much slower so leg and or arm hair could hold THC for up to twice the duration. That's pretty much it. I also got a cheek swab and piss test.