For experts witness you ask them to state their name, position and at times have a listing ( in writing) of their expert status, showing education, other court cases they have testified at. You would either have this read into evidence by the witness to prove he is an expet. You have to prove first to the jury that he is not just a homeless man off the street you brought in, but some who is qualifed to testify.
Next their needs to be photos of the trauma, the medical report and even over all photo of the victim.
And no opinion questions, only yes and now questions, also you prep your witenss before so they know what you are going to ask and can practice answers ( this is real life) with your witnesses.
Also remember you are talking to the jury ( or judge but most mock trials are always in front of a jury for some reason) you are not talking really to the witness, you look at him to make eye contact, but you are showing the jury the evidnece
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