If the witness appeared on the day trial had been originally set for you could have asked the court to order the witness back for the new date. Unfortunately, that did not happen so you will have to start over with the subpoena. Good luck.
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Yes you will have to send another subpoena. Unfortunately, if you had asked to the judge to do so, the judge could have simply ordered all subpoenaed witnesses to return on the new date.
Good luck to you.
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