One of my family members I guess has been smoking pot not directly in my daughters face, but she has I guess entered the room when he was smoking, one of his friends called DHS and they did a hair follicle test on her, will it show up if he has? How much exposure is needed for it to show up in her hair, I am very concerned, if it shows up negative I don't want to accuse him of doing that, but if he is and its not showing up I don't want to be a fool either.