Hair drug test for Xanax

Hi everyone, I realize this is a marijuana website but havent found anywhere else to ask this, hopefully someone here will have some knowledge on this. I about a week ago took .25mg of Xanax, I took it because I was having trouble sleeping and my aunt who is precribed it for sleeplessness gave me the pill. It is the lowest dose Xanax as far as I know and it is the only time I have used it. I have a possible hair drug test coming up for pre-employment. I'm hoping the low dose will not show as a positive test, or the company(GM) does not test for Xanax. If anyone can give me some information that would be great, thanks.

Recepted, we don't talk about other drugs except for a few exceptions when it relates directly to marijuana use. You can find all the information you need but not here. Thread closed and soon to be deleted.