§ 40.335 Rule 606. Competency of juror as witness

Here's a plain English summary:

If you're serving on a jury, you can't also take the witness stand and testify in that same trial. The law keeps these two roles separate. A juror is supposed to listen to evidence and decide the case, not become part of the evidence itself.

If someone tries to call a juror to testify anyway, the other side in the case gets a chance to object. This objection happens away from the rest of the jury, so they don't hear the argument about whether their fellow juror should testify. This keeps the jury from being influenced by something they shouldn't consider.

This rule protects the fairness of the trial. It stops a situation where a juror's job of judging the facts gets mixed up with being a source of facts. It also makes sure the other jurors aren't swayed just because one of their own is put on the stand.