In certian states, if a juror brings it to the judges attention prior to the rendering of the verdict, he can excuse a juror who is trying to nullify.
Is this law or is this protocol?
I have no problem with single jurors attempting to nullify being excused as a mistrial doesn't help anyone. However, if a juror can convince 11 other people that the law pertaining to that particular case just simply should not apply and that justice would not be served by returning a guilty verdict, then hey, that's the result of a closed jury room.