An expert opinion is the informed perspective or conclusion provided by an individual with specialized knowledge, skills or experience in a particular field. When used effectively, expert opinions can be powerful tools in legal proceedings by adding credibility and weight to arguments. However, when expert opinions are based on flawed reasoning or fall outside the scope of evidence available, they can be devastating to legal cases.
Expert testimony is a formal, sworn statement that an expert witness provides in front of a judge and jury during a trial. During the course of a trial, an expert’s testimony may be challenged through cross-examination. The purpose of a good cross-examination is to expose failures in logic or any other biases that may render the expert’s opinions less credible.
The use of experts has become increasingly important to consumers, particularly for products that are difficult to assess in advance. For example, the purchase of wine can be an expensive investment, and consumers who are not seasoned connoisseurs may seek guidance from a wine retail manager when making their selection.
While experts are able to base their opinions on information not normally admissible in court, Pennsylvania law requires that the expert disclose all facts and data that they reviewed in order to form their opinion. Whether the expert’s work product passes this test will be an important factor in their ability to form a credible, persuasive expert opinion.
About the Author
