try dying or bleaching your hair. that's what i used to do when i would get hair tested. theres still a slight possibility it will show up but dying your hair will normally do the trick.
Amphetamines
yes it will show up i have recently been drug tested and it does put you over the legal amount of amphetamines it does not show up as meth but it does show up as amphetamines
It will depend on how long it has been since the drugs were used. They can take a sample of hair and test it from root to end. There are places that will "wash" your hair but just know nothing is %100... Thanks, DefTone
Adipex (phentermine) may initially cause a false positive for amphetamines, though further testing will resolve the problem.
Vikoden is NOT an amphetamine. It will show up as an opiate.
You have a muscle at the bottom of a hair strand. Your hair itself has no muscles.
Methamphetamine will show up as methamphetamines, and/or in some cases amphetamines. It will not show up as opiates.
NO, in short hair test only test for the drugs that are in hair follicle, they do not test the quantity of the drug in the follicle. so the hair drug test will show you as being positive for amphetamines, but they can't determine how much amphetamines was used, so going from 20's to 30's will show up no different on a hair test.
Pseudoephedrine, a meth precursor, can show up as amphetamines.
adderall
It depends whether they are testing hair from the head or hair for the body. Normally it is 90 days (with a standard test) but it can be up to a year if they test body hair. Check out the link I added for detailed information.