Legal Dictionary of Pakistan

opinion rule

Evidence. The principle that a witness should testify to facts, not opinions, and that a witness's opinions are often excludable from evidence. ( Traditionally, this principle is regarded as one of the important exclusionary rules in evidence law. It is 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. Under this system, the witness's opinion is unnecessary.