bullshit!
the hair test show many drugs used months ago.
You're correct, but that test is extremely expensive and takes months before results.
No it doesn't...i know people that have used the shampoo and it works. But they have to wash their hair (all hair...just in case!) the day they're taking the test. Otherwise it wears off or something.
HP uses it for call center employees making $8/hr.
And it seemd to take less than a week for results.