Only information that complies with certain rules (the rules of evidence) can be given to the jury by a witness. It is on this information alone that the jury must decide if the accused is guilty or not guilty.
If the prosecutor or the defendant object to certain information being given to the jury, the judge must decide (usually when the jury is not present in the courtroom) whether it complies with these rules.
If it does comply, then it is included in the evidence and the jury can hear it, if not, it is excluded and the jury do not hear this evidence, see evidence.
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