What are the rules of evidence to be presented in criminal cases?

In California, evidence is any type of information used to prove or disprove a fact. The rules of evidence govern how information can be presented in criminal cases. First, the prosecution must prove beyond a reasonable doubt that a crime has been committed. Those charged with the crime then have a right to present evidence in their defense. In order to be accepted as evidence in court, the evidence must be relevant to the case being tried. In other words, the evidence must be connected to the facts of the case and must help to prove or disprove the facts. Additionally, the evidence must be material, which means that it must have a direct effect on the case. Evidence also must be reliable, which means it must be believable and backed up by facts. Furthermore, to be accepted as evidence, the party presenting it must be able to prove its authenticity. Additionally, any evidence that could be considered prejudicial by either side may be disallowed. Finally, hearsay evidence, which is information given by someone other than the witness talking, is usually not allowed. Exceptions to this rule are evidence given by experts or statements given by someone who is unavailable to testify. These rules of evidence help ensure that criminal cases are fair and that evidence presented is valid and reliable.

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