Do the hair shampoos show up on the test? Can they determine if a shampoo has been used? They wash the hair before they test it, so will this affect the effect of the shampoo? I noticed one shampoo on the http://mbdetox.com/Pass-HAIR-Drug-Test_c8/ link that was suggested. It had a 500% money back guarantee, so if my girlfriend fails her test, because, the product didn't work then do they refund our purchase 500%?
Another concern I have is that they may ask us not to wash our hair before doing the test. Is this unheard of?
Thank you for your insight.