Today, the DON at the place where I am employed notified me that I made a med error. She stated that I hung an incorrect ABT for a resident. The Don stated that she knows it was me because I initialed the bag and the next nurse went to hang her scheduled dose and noticed the error. There's two things that I have a bad habit of doing, not putting my initials on the IV bag itself and tossing the entire bag after my IV's are complete in the garbage, after removing the patient information from the bag. I stated to the DON that I never inital the bag and I always throw them away afterwards. I asked her when this incident occured and she replied oh about a month ago, I asked her why I was not notifed of this when it happened and she stated that she was very busy and had so many things to take care of and that she had to investigate it. I then asked to review the report so I could see the exact date and medication infomation. She begin to look around in a drawer with scattered paperwork and said oh it must be out waiting for the MD's signiture. This all sounds very strange to me. I am currently having to deal with the same exact person trying to force me into a nursing supervisor position I am not qualified for I actually was forced into the position one night without training or prior notification and was very concerned. I've refused this responsibility several times sincetim even after explaining my concerns to the DON over and over again. I really hate to think this, but it really seemed to me that she may be picking r/t my refusal of the supervisor position and may be looking for reason to terminate my employment. I would love to hear your comments.