During a trial, information may be presented that may not be considered by the jury. The judge decides what evidence is proper and admissible. The judge may allow the jury to hear certain testimony or to see particular exhibits. The judge also may shield the jury from certain information. Although the judges decides what evidence the jury may consider, individual jury members decide whether that evidence is believable, and how important it is to the case.
Witnesses are the eyes, ears and senses of the jury.
Cross-examination will help jury members to considering the validity of testimony. Cross-examination often shows another perspective to the witness' testimony, and helps to provide a more complete understanding of what a witness saw or heard. During a trial, the attorneys may object to questions asked by their opponent. This is common and an important part of an attorney's job. A trial must be conducted according to rules.