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Are there lines of reasoning that can only be introduced into a case via an expert witness?

Yes; opinions Experts are the only type of witness that is allowed to testify as to their opinion; all other witnesses may only testify as to the facts (what they directly experienced). For example, ...
Dale M's user avatar
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5 votes

Are there lines of reasoning that can only be introduced into a case via an expert witness?

You'll generally need an expert witness to testify to anything that requires "scientific, technical, or other specialized knowledge" beyond the knowledge of the average person. So although a ...
bdb484's user avatar
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18 votes
Accepted

Introducing evidence into trial in the US

How does one introduce evidence into trial? Do all evidences have to be introduce into trial before trial starts? Can I bring evidences on the day of the trial and introduce them on the fly to the ...
ohwilleke's user avatar
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