Originally Posted by TrancedAmber
1/2 inch of hair per month. 2 months would go back an inch on your hair...I know the question wasn't asked, but I figured it might be helpful
actually, there is no set amount in the hair as far as time. The company has an option of how far back they want to go with the test. The more money you are willing to pay, the deeper they will analyze the hair...If you pay enough, they can test back to the day you were born through annalysis of the folicle.