Opinion Rule Law and Legal Definition
Opinion rule is an exclusionary rule of evidence law which says a witness should testify to facts, not opinions. Further, a non expert witness's opinions are to be excluded from evidence. Traditionally, opinion rule was one of the most important exclusionary rules in evidence law. It was based on the idea that a witness who has observed data should provide the most factual evidence possible, leaving the jury to draw inferences and conclusions from the evidence. However, the rules are not of relevance now and at present opinions are admissible if it is rationally based on a witness's perceptions and helpful to the fact-finder.
