Give her enough rope and she'll probably hang herself! Before I retired I had a co-worker who was the biggest 2-faced individual I ever met, but it took me a while to find out. She was always buddy-buddy, sociable, etc and we were on good terms for quite a few years. I'd pick her up if she needed a ride, help her out if she got behind on her work, etc. Then the worm turned - sweet to my face and then stabbing me when I turned my back. My supervisor was aware of it, but couldn't prove anything, and gossip was no grounds to fire someone. In our department we had a computer that anyone could use, as well as our own at our desk. One day when I had to use the department computer, I found e-mail that this co-worker had sent (and was stupid enough not to delete it), ordering illegal drugs from overseas and having them shipped to the company mailroom. I printed it, and then searched back through e-mails and found she had been doing this for a long time. I guess she thought no one would find it if it wasn't on her computer. I didn't want to rat on her, but my supervisor had suspected for a long time that she was coming to work high, and instructed me that she needed to know anything adverse. I held on to those printed emails for quite a while and didn't turn them in until I had to - the day my co-worker tried to pin a costly mistake that she had made on me. Obviously - she was terminated shortly after.