Quote Quoting lorie42
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Does the state have to subpeona any and all witnesses within the state that I request, including expert witnesses?
You will need to retain and pay your experts, and make sure that their schedules are clear for the dates of their testimony.

You can't force somebody to give expert testimony on your behalf. If you issue a subpoena to somebody who is not a fact witness and has not been retained as an expert, you should expect to be sanctioned by the court.