In the long run, if they want you out they can get most anyone in a year or two.
I worked as a Sergeant in NY State's Department of Corrections. They had an evaluation program where immediate supervisors had to fill out evaluation forms, sign them, and submit them for approval to their Watch Commander (Lieutenant). It was all a bunch of crap. We were were told we couldn't give officers a score of excellent because it wouldn't give them an incentive to be better. In defiance, I gave all the officers I evaluated an excellent. I was called in by the Watch Commander and asked why I had given them all an excellent rating, and I said it was because they were excellent. When he brought up the word-of-mouth rule that we weren't supposed to do that. I replied, then if we're not supposed to check the "excellent" box, why is it even provided on the form? He had nothing to say in response, and I left his office. He never questioned me again. One time he gave me an evaluation with his own personal comments on it. I refused to sign it, and he ended up having to change his comment because it was his own personal opinion, not based on any actual evidence he could provide to back it up. Can't remember what his comment was, but it was out-of-line, and had no place on an evaluation form. He probably didn't think I'd challenge him on it. When he presented me with a corrected evaluation, after I read it, and approved of it, I signed it.