I have a sister that just left her husband back in March. She has just been diagnosed with a muscle disorder which is causing low oxygen. Her carbon dioxide runs about 70+. They are trying to determine which muscle disorder she has. Here is what I am trying to ask. I recently found out that her husband use to put xanax in her drinks without her knowing to knock her out. I have a recording of this person that said that her husband would brag about it. Now my quesion; would xanax do this to a person? I really do not know how much he has given her at one time.