I understand all to well what you are going through, though I was dealing with depression and not the drug issues, I too was confronted by my manager and informed that I was going to be reported because of changes in character and for things another nurse reported that was not true... they did not follow procedure either and never did they call the other nurse in for a one on one information gathering session...
I felt I was backed into a corner and jumped through all the hoops that was required. I am in the TPAPN program in Texas and seeing a therapist like a good girl... yea that is me...
What I did found out through the therapist was the following:
1. The manager that I was under at that time did not follow procedure and failed to show me my personel file with all the accusations.
2. After going to the human resources and getting a copy of everything in my file... Shocked not... I had more pluses, and only her complaint in my practice. (She told me that I had several complaints...)
3. I came to find out that my Therapist to my surprise and luck was a member of the TPAPN and is helping me clear my name... though I still have to stay in the program.
I was encourage by her to take my story to the state workforce commission.... They listen and took the copies I had and took the case.
I am not wanting financial payback... but just my file cleaned and my reputation cleared.
So if you can contact the workforce commission and tell them your story, you have nothing to lose.... if they think your manager failed to follow proceedures that the hospital has in place to protect the employees and the public.
I wish you luck...