Which type of testimony is typically omitted from expert witness statements?

In the context of expert witness statements, opinion testimony is considered to be specialized and requires a foundation of expertise in a particular field. Expert witnesses are called upon to provide insights that go beyond common knowledge, offering their opinions that are based on their expertise, methodologies, and relevant data. However, opinion testimony is often narrowly tailored to the scientific or technical issues at hand, and it typically does not incorporate personal feelings or subjective views as an individual might convey in a personal context.

Expert witnesses focus on delivering conclusions derived from empirical data and established scientific principles, thus omitting personal opinion or emotional factors that do not stem from expertise. This is essential because the role of an expert witness is to aid the court in understanding complex issues in a clear and objective manner, rather than to introduce personal bias or subjective interpretations that might cloud the factual findings. Thus, in expert witness statements, factual evidence and technical analyses may be emphasized while opinion testimony—particularly when it lacks basis in the specified field or does not adhere to the factual matrix—may be excluded.

This structured approach is necessary to ensure the integrity and reliability of the testimony provided in legal proceedings, contributing to an effective judicial process.