So, FYI, I told my HR manager today (thanks, Scaredycat), and it turns out that I didn't even show up dirty in the drug screen. She said I probably didn't have enough in my system (as mentioned in previous posts, I don't take my Xanax that much).
What she did tell me, which will be helpful to a lot of you out there, is that when drug tests DO come back dirty, she always thinks right away that you are probably on a medication, and then all you have to do is provide proof to the drug screening company. I was really happy to hear that HR was so
open to people who have differences.
So, I'm in the clear...worried for nothing...and it kinda seems like others don't have to worry, as long as you are responsible with carrying your Rx's the right way and being up front with your manager!