What role do expert witnesses play in criminal trials?

Expert witnesses play a crucial role in criminal trials by offering specialized knowledge that is pertinent to the particular case. Their testimony is based on their expertise in specific fields such as forensic science, medicine, psychology, or engineering, among others. This specialized knowledge helps the jury and the judge understand complex issues that are beyond the common understanding of laypersons. For instance, an expert in forensic biology may explain DNA evidence and its significance, thereby aiding in the jury's comprehension of the evidence presented.

Their function is not to determine guilt or innocence, evaluate the legal team's performance, or offer opinions based on general knowledge; rather, they provide insights that assist in deciphering technical evidence and give context to complicated subject matter relevant to the case. This can be vital in forming an informed verdict based on the evidence presented in court.