What are the rules for witness testimony in criminal cases?

Witness testimony is an important factor in criminal cases. In California, witnesses must follow certain rules when they testify to ensure the accuracy and fairness of the trial. First, witnesses must answer all questions truthfully and fully. Witnesses may not withhold any information that would be pertinent to the case. Witnesses must also be capable of understanding the questions asked and must provide clear and complete answers. Second, witnesses must only testify to matters within their personal knowledge. This means that they must only testify to things they have seen, heard, or personally experienced. In some cases, witnesses may be allowed to testify to certain facts that they were told by a reliable source. Third, witnesses may not offer opinions or conjectures. This means that witnesses may not offer their own personal judgment on matters. Witnesses may instead only offer facts that they experienced or observed. Fourth, witnesses must not discuss their testimony with anyone until the trial has concluded. Witnesses may be asked to refrain from discussing their testimony with others, even after the trial has ended, to protect the integrity and accuracy of the trial. Witnesses must adhere to these rules when testifying in criminal cases in California to ensure the fairness of the trial and to provide the court with the most accurate information. By following these rules, the court is able to identify the truth and make a fair decision.

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