Your question is incomplete and there we can only guess how to answer. If you are a party and unrepresented by counsel, you can have the clerk of the circuit court issue a subpoena. If you are subpoenaing a lay person, then in accordance with (705 ILCS 35/Sec. 4.3. you must pay$20 per day plus $.20 per mile round trip. If you wish to subpoena an expert, then the expert will set his or her fee for appearance in court.
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