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In law, a witness is someone who, either voluntarily or under compulsion, provides testimonial evidence, either oral or written, of what they know or claim to know.. A witness might be compelled to provide testimony in court, before a grand jury, before an administrative tribunal, before a deposition officer, or in a variety of other legal proceedings.
Attorneys must lay a foundation for witness testimony at trial. [26] The process differs when the witness is a lay witness or an expert witness. [26] However, as a baseline matter for both expert and lay witnesses, the testimony must be established to be helpful in assisting the trier of fact understand a fact at issue in the case. [27] [28]
The trier of fact is a judge in bench trials, or the jury in any cases involving a jury. [1] The law of evidence is also concerned with the quantum (amount), quality, and type of proof needed to prevail in litigation. The rules vary depending upon whether the venue is a criminal court, civil court, or family court, and they vary by jurisdiction.
The rule excluding hearsay arises from a concern regarding the statement's reliability. Courts have four principal concerns with the reliability of witness statements: the witness may be lying (sincerity risk), the witness may have misunderstood the situation (narration risk), the witness's memory may be wrong (memory risk), and the witness's perception was inaccurate (perception risk). [8]
An expert witness is a witness, who by virtue of education, training, skill, or experience, is believed to have expertise and specialised knowledge in a particular subject beyond that of the average person, sufficient that others may officially and legally rely upon the witness's specialized (scientific, technical or other) opinion about an evidence or fact issue within the scope of his ...
The educating witness teaches the fact-finder (jury or, in a bench trial, judge) about the underlying scientific theory and instrument implementing theory. This witness is an expert witness, called to elicit opinions that a theory is valid and the instruments involved are reliable.
Historically, to be admissible in court and to ensure maximum reliability and validity, written testimony presented in the form of an affidavit (i.e., the witness would not be appearing in court at the hearing at which the affidavit was considered as evidence) was usually witnessed by another person (in many common law jurisdictions, a notary ...
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 ...