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In United States law, the Frye standard, Frye test, or general acceptance test is a judicial test used in some U.S. state courts to determine the admissibility of scientific evidence. It provides that expert opinion based on a scientific technique is admissible only when the technique is generally accepted as reliable in the relevant scientific ...
For evidence to be admissible enough to be admitted, the party proffering the evidence must be able to show that the source of the evidence makes it so. If evidence is in the form of witness testimony, the party that introduces the evidence must lay the groundwork for the witness's credibility and knowledge.
An example of inadmissible evidence is that the prosecution generally cannot present character evidence, such as old convictions for unrelated crimes. Courts have ruled that while past criminal behavior may have probative value (because it increases the probability of future criminal behavior) such evidence is too prejudicial to be allowed, as ...
Evidence governs the use of testimony (e.g., oral or written statements, such as an affidavit), exhibits (e.g., physical objects), documentary material, or demonstrative evidence, which are admissible (i.e., allowed to be considered by the trier of fact, such as jury) in a judicial or administrative proceeding (e.g., a court of law).
The Federal Rules of Evidence states rules regarding a piece of evidence's relevancy and whether or not it is admissible. [7] F.R.E. 402 states relevant evidence is admissible unless otherwise excluded by: "The U.S. Constitution, a federal statute, the Federal Rules of Evidence, or other rules proscribed by the Supreme Court."
Under the common law, such evidence was at one time considered hearsay - a statement made out of court being introduced to prove the truth of the statement - and was not admissible except to rebut the testimony of an opposing expert witness. There were four ways to introduce such evidence: [citation needed]
Wright had argued that the letters were admissible because they showed that the testator was seen and treated as a competent in the eyes of those who knew him. Tatham argued that they were inadmissible and so would have to sworn under oath before they could be admissible.
For example, in a DUI case, the prosecutor may not admit evidence of a prior instance of driving impaired to show that the defendant acted in conformity and drove impaired on the day he is charged with doing so. However such evidence may be admissible if the defense has argued the defendant had no knowledge driving impaired was a crime.