
Opinion evidence refers to evidence of what the witness thinks, believes, or infers in regard to facts, as distinguished from personal knowledge of the facts themselves. In common law jurisdictions the general rule is that a witness is supposed to testify as to what was observed and not to give an opinion on what was observed. However, there are t...
Found on
http://en.wikipedia.org/wiki/Opinion_evidence

What a witness thinks, believes or infers regarding disputed facts. Generally admissible only when given by an expert witness unless opinion is based on matters common to lay persons.
Found on
http://www.pacourts.us/learn/legal-glossary
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