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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.
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]
In Canada, the rule is established in R. v. Handy, 164 CCC (3d) 481, 2 SCR 908 (2002): . Evidence of prior bad acts by the accused will be admissible if the prosecution satisfies the judge on a balance of probabilities that, in the context of the particular case, the probative value of the evidence in relation to a specific issue outweighs its potential prejudice and thereby justifies its ...
However, as with the application of this doctrine elsewhere, the plain view doctrine only justifies a seizure of evidence or contraband that is in plain view, and it does not justify a further search. In United States v. Carey, [24] a detective was searching a computer for evidence of drug trafficking. When he opened an image file that depicted ...
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).
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 ...
In Daubert, the court ruled that nothing in the Federal Rules of Evidence governing expert evidence "gives any indication that 'general acceptance' is a necessary precondition to the admissibility of scientific evidence. Moreover, such a rigid standard would be at odds with the Rules' liberal thrust and their general approach of relaxing the ...
To be admissible, the evidence referred to in the document must itself be admissible. The person supplying the information must have had personal knowledge of it (or be reasonably supposed to have had), and everyone else through whom the information was supplied must have also been acting in the course of business.