What is an expert witness?

An expert witness is someone who has specialized knowledge in a particular field and is called upon to testify in court. Expert witnesses in Pennsylvania are used to give evidence and explain complex topics that are beyond the knowledge of the average person. This type of witness is commonly used for scientific or medical evidence. Expert witnesses provide evidence and opinions to the court. The expert witness must have knowledge that is specific to the case or that may be consulted to help the trier of fact (jury or judge) reach a decision. Expert witnesses may be called to the stand by the prosecution, the defense, or the court. It is the duty of the expert witness to remain unbiased and honest when giving their testimony. In Pennsylvania, lawyers may submit expert witness affidavits or testimony from an expert witness. An expert witness affidavit is a written statement from the expert verifying their knowledge and experience. Expert testimony is taken in the presence of the court or trier of fact directly and allows for both parties to ask questions. Expert witnesses in Pennsylvania may also be required to write reports or evaluations and may also be asked to provide further direct testimony.

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