Hair test? What? Somone testing you're hair for marijuana? Were you using it mixed with shampoo or something?
Hair tests are the most accurate way of telling if someone has smoked marijuana. Accurate up to about 90 days. The problem is there super expensive.
Hmm... I've never heard of them... how can you tell by someone's hair that they smoke marijuana? I'm sure we don't get these sorta things in the UK
some companies now do PreScreening testing via hair and employment is granted if you pass the hair test...